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CVE Vulnerability Details :
CVE-2026-4717
PUBLISHED
More InfoOfficial Page
Assigner-mozilla
Assigner Org ID-f16b083a-5664-49f3-a51e-8d479e5ed7fe
View Known Exploited Vulnerability (KEV) details
Published At-24 Mar, 2026 | 12:30
Updated At-13 Apr, 2026 | 13:51
Rejected At-
▼CVE Numbering Authority (CNA)
Privilege escalation in the Netmonitor component

Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Affected Products
Vendor
Mozilla CorporationMozilla
Product
Firefox
Versions
Unaffected
  • From 140.9 through 140.* (rpm)
  • From 149 through * (rpm)
Vendor
Mozilla CorporationMozilla
Product
Thunderbird
Versions
Unaffected
  • From 140.9 through 140.* (rpm)
  • From 149 through * (rpm)
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Satoki Tsuji
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://bugzilla.mozilla.org/show_bug.cgi?id=2021695
N/A
https://www.mozilla.org/security/advisories/mfsa2026-20/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-22/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-23/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-24/
N/A
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=2021695
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-20/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-22/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-23/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-24/
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-noinfoCWE-noinfo Not enough information
Type: CWE
CWE ID: CWE-noinfo
Description: CWE-noinfo Not enough information
Metrics
VersionBase scoreBase severityVector
3.19.8CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Version: 3.1
Base score: 9.8
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found