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#f16b083a-5664-49f3-a51e-8d479e5ed7fe

Security Advisories

Reported CVEsVendorsProductsReports
2627Vulnerabilities found
CVE-2026-14899
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-Not Assigned
EPSS-0.19% / 8.50%
||
7 Day CHG~0.00%
Published-22 Jul, 2026 | 19:19
Updated-22 Jul, 2026 | 20:33
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Off-by-one out of bounds read in MIME header parser for forwarding

The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-Thunderbird
CVE-2026-16361
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.33% / 25.28%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 15:52
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Thunderbird ESR 140.13

Memory safety bugs present in Thunderbird ESR 140.12. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2026-16360
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.35% / 27.23%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 15:07
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153

Memory safety bugs present in Firefox ESR 115.37, Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2026-16412
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.33% / 24.95%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 05:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153

Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2026-16411
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.31% / 23.09%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 05:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox 153

Memory safety bugs present in Firefox 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2026-16410
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.32% / 24.13%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:46
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
JIT miscompilation in the JavaScript Engine: JIT component

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2026-16409
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.31% / 22.88%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:45
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Invalid pointer in the Security: PSM component

Invalid pointer in the Security: PSM component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-824
Access of Uninitialized Pointer
CVE-2026-16408
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.34% / 25.99%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-22 Jul, 2026 | 20:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Integer overflow in the Audio/Video: Playback component

Integer overflow in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxThunderbirdFirefox
CWE ID-CWE-190
Integer Overflow or Wraparound
CVE-2026-16407
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.31% / 23.53%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:45
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the DOM: Service Workers component

Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-284
Improper Access Control
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16406
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.1||CRITICAL
EPSS-0.24% / 15.86%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-22 Jul, 2026 | 20:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the Networking component

Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16405
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.26% / 17.19%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-22 Jul, 2026 | 20:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Information disclosure in the Networking: WebSockets component

Information disclosure in the Networking: WebSockets component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxThunderbirdFirefox
CWE ID-CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CVE-2026-16404
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.4||HIGH
EPSS-0.17% / 6.69%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Spoofing issue in Firefox for Android

Spoofing issue in Firefox for Android. This vulnerability was fixed in Firefox 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefox_mobileFirefox
CWE ID-CWE-290
Authentication Bypass by Spoofing
CVE-2026-16403
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-6.5||MEDIUM
EPSS-0.21% / 11.46%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:44
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Spoofing issue in the Address Bar component

Spoofing issue in the Address Bar component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-451
User Interface (UI) Misrepresentation of Critical Information
CVE-2026-16402
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.32% / 24.13%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:44
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Integer overflow in the Graphics: ImageLib component

Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-190
Integer Overflow or Wraparound
CVE-2026-16401
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.29% / 21.61%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:43
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Privilege escalation in the Data Loss Prevention component

Privilege escalation in the Data Loss Prevention component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-269
Improper Privilege Management
CVE-2026-16400
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.26% / 18.09%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:43
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Information disclosure in the DOM: Security component

Information disclosure in the DOM: Security component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CVE-2026-16399
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.16% / 5.45%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:43
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Site isolation issue in the DOM: Navigation component

Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-346
Origin Validation Error
CVE-2026-16398
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.16% / 5.45%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:42
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Site isolation issue in the Graphics component

Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CWE ID-CWE-346
Origin Validation Error
CVE-2026-16397
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-6.5||MEDIUM
EPSS-0.17% / 7.08%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-22 Jul, 2026 | 18:29
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Clickjacking issue in the WebExtensions component in Firefox for Android

Clickjacking issue in the WebExtensions component in Firefox for Android. This vulnerability was fixed in Firefox 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-1021
Improper Restriction of Rendered UI Layers or Frames
CVE-2026-16396
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.33% / 25.49%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 15:18
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Privilege escalation in WebExtensions

Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-269
Improper Privilege Management
CVE-2026-16395
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.34% / 25.99%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-23 Jul, 2026 | 14:55
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Integer overflow in the Audio/Video component

Integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxThunderbirdFirefox
CWE ID-CWE-190
Integer Overflow or Wraparound
CVE-2026-16394
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.1||CRITICAL
EPSS-0.24% / 15.86%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-22 Jul, 2026 | 20:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the DOM: Security component

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16359
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.1||CRITICAL
EPSS-0.28% / 20.22%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 15:32
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Incorrect boundary conditions in the Audio/Video: GMP component

Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2026-16393
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.1||CRITICAL
EPSS-0.32% / 24.13%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:42
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Incorrect boundary conditions in the Graphics: WebGPU component

Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2026-16392
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-Not Assigned
EPSS-0.15% / 4.67%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-22 Jul, 2026 | 20:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
JIT miscompilation in the JavaScript Engine: JIT component

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-ThunderbirdFirefox
CVE-2026-16391
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.34% / 26.76%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 15:18
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Information disclosure in the Storage: IndexedDB component

Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CVE-2026-16390
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.1||CRITICAL
EPSS-0.35% / 27.94%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 15:18
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the Enterprise Policies component

Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16389
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.40% / 32.59%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:41
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Incorrect boundary conditions, integer overflow in the Libraries component in NSS

Incorrect boundary conditions, integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-190
Integer Overflow or Wraparound
CVE-2026-16388
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.40% / 32.60%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:41
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Sandbox escape in the DOM: Networking component

Sandbox escape in the DOM: Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16387
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.22% / 12.30%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 15:19
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Site isolation issue in the Networking component

Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CWE ID-CWE-284
Improper Access Control
CWE ID-CWE-346
Origin Validation Error
CVE-2026-16386
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.33% / 25.57%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-22 Jul, 2026 | 20:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Information disclosure due to uninitialized memory in the Graphics: WebGPU component

Information disclosure due to uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-ThunderbirdFirefox
CWE ID-CWE-908
Use of Uninitialized Resource
CVE-2026-16385
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.33% / 25.57%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-22 Jul, 2026 | 20:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Information disclosure due to uninitialized memory in the Graphics: WebGPU component

Information disclosure due to uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-ThunderbirdFirefox
CWE ID-CWE-908
Use of Uninitialized Resource
CVE-2026-16384
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.33% / 25.57%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-22 Jul, 2026 | 20:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Information disclosure due to uninitialized memory in the Graphics: WebGPU component

Information disclosure due to uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-ThunderbirdFirefox
CWE ID-CWE-908
Use of Uninitialized Resource
CVE-2026-16383
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.43% / 35.48%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:19
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the DOM: Networking component

Mitigation bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16382
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.43% / 34.74%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 16:40
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the DOM: Service Workers component

Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16381
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.1||CRITICAL
EPSS-0.19% / 9.43%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:19
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Same-origin policy bypass in the Networking: DNS component

Same-origin policy bypass in the Networking: DNS component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-346
Origin Validation Error
CVE-2026-16380
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.1||CRITICAL
EPSS-0.35% / 27.08%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 16:39
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the Networking component

Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16358
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.23% / 13.92%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:29
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Site isolation issue in the Graphics: WebRender component

Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-346
Origin Validation Error
CVE-2026-16379
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.38% / 30.78%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:19
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Privilege escalation in the DOM: Content Processes component

Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-269
Improper Privilege Management
CVE-2026-16378
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.33% / 24.96%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 16:39
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Other issue in the DOM: Copy & Paste and Drag & Drop component

Other issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-20
Improper Input Validation
CVE-2026-16377
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.43% / 35.48%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:19
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the PDF Viewer component

Mitigation bypass in the PDF Viewer component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16376
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.39% / 31.10%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 16:38
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Denial-of-service in the Graphics: WebGPU component

Denial-of-service in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-400
Uncontrolled Resource Consumption
CVE-2026-16375
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.22% / 13.00%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Site isolation issue in the Networking: HTTP component

Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-346
Origin Validation Error
CVE-2026-16374
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.34% / 26.76%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:19
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Information disclosure in the Framework component in DevTools

Information disclosure in the Framework component in DevTools. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CVE-2026-16373
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.29% / 21.08%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 16:27
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Information disclosure in the Privacy component in Firefox for Android

Information disclosure in the Privacy component in Firefox for Android. This vulnerability was fixed in Firefox 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefox_mobileFirefox
CWE ID-CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CVE-2026-16372
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.37% / 29.53%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 16:38
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Privilege escalation in the DOM: Content Processes component

Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-269
Improper Privilege Management
CVE-2026-16371
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.38% / 30.78%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:12
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Privilege escalation in the DOM: Navigation component

Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-269
Improper Privilege Management
CVE-2026-16370
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.1||CRITICAL
EPSS-0.35% / 27.08%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 16:35
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the DOM: Networking component

Mitigation bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16357
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.43% / 35.28%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:28
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Incorrect boundary conditions in the Graphics component

Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2026-16356
Assigner-Mozilla Corporation
ShareView Details
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.42% / 34.34%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:37
Updated-24 Jul, 2026 | 15:28
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Sandbox escape due to use-after-free in the Disability Access APIs component

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-416
Use After Free
CWE ID-CWE-693
Protection Mechanism Failure
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