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Vulnerability Details :

CVE-2026-23866

Summary
Assigner-Meta
Assigner Org ID-4fc57720-52fe-4431-a0fb-3d2c8747b827
Published At-01 May, 2026 | 16:02
Updated At-01 May, 2026 | 17:42
Rejected At-
Credits

Incomplete validation of AI rich response messages for Instagram Reels in WhatsApp for iOS v2.25.8.0 to v2.26.15.72 and WhatsApp for Android v2.25.8.0 to v2.26.7.10 could have allowed a user to trigger processing of media content from an arbitrary URL on another user’s device, including triggering OS-controlled custom URL scheme handlers. We have not seen evidence of exploitation in the wild.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:Meta
Assigner Org ID:4fc57720-52fe-4431-a0fb-3d2c8747b827
Published At:01 May, 2026 | 16:02
Updated At:01 May, 2026 | 17:42
Rejected At:
▼CVE Numbering Authority (CNA)

Incomplete validation of AI rich response messages for Instagram Reels in WhatsApp for iOS v2.25.8.0 to v2.26.15.72 and WhatsApp for Android v2.25.8.0 to v2.26.7.10 could have allowed a user to trigger processing of media content from an arbitrary URL on another user’s device, including triggering OS-controlled custom URL scheme handlers. We have not seen evidence of exploitation in the wild.

Affected Products
Vendor
FacebookFacebook
Product
WhatsApp for Android
Default Status
unaffected
Versions
Affected
  • From 2.25.8.0 before 2.26.7.10 (semver)
Vendor
FacebookFacebook
Product
WhatsApp for iOS
Default Status
unaffected
Versions
Affected
  • From 2.25.8.0 before 2.26.15.72 (semver)
Problem Types
TypeCWE IDDescription
N/AN/AImproper Verification of Source of a Communication Channel (CWE-940)
Type: N/A
CWE ID: N/A
Description: Improper Verification of Source of a Communication Channel (CWE-940)
Metrics
VersionBase scoreBase severityVector
3.14.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C
Version: 3.1
Base score: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.facebook.com/security/advisories/cve-2026-23866
x_refsource_CONFIRM
https://www.whatsapp.com/security/advisories/2026
x_refsource_CONFIRM
Hyperlink: https://www.facebook.com/security/advisories/cve-2026-23866
Resource:
x_refsource_CONFIRM
Hyperlink: https://www.whatsapp.com/security/advisories/2026
Resource:
x_refsource_CONFIRM
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-940CWE-940 Improper Verification of Source of a Communication Channel
Type: CWE
CWE ID: CWE-940
Description: CWE-940 Improper Verification of Source of a Communication Channel
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve-assign@fb.com
Published At:01 May, 2026 | 16:16
Updated At:04 May, 2026 | 15:21

Incomplete validation of AI rich response messages for Instagram Reels in WhatsApp for iOS v2.25.8.0 to v2.26.15.72 and WhatsApp for Android v2.25.8.0 to v2.26.7.10 could have allowed a user to trigger processing of media content from an arbitrary URL on another user’s device, including triggering OS-controlled custom URL scheme handlers. We have not seen evidence of exploitation in the wild.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-940Secondary134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE ID: CWE-940
Type: Secondary
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://www.facebook.com/security/advisories/cve-2026-23866cve-assign@fb.com
N/A
https://www.whatsapp.com/security/advisories/2026cve-assign@fb.com
N/A
Hyperlink: https://www.facebook.com/security/advisories/cve-2026-23866
Source: cve-assign@fb.com
Resource: N/A
Hyperlink: https://www.whatsapp.com/security/advisories/2026
Source: cve-assign@fb.com
Resource: N/A

Change History

0
Information is not available yet

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