Improper verification of communication channel in Meta WhatsApp for Android
Priority LOW 20CWE-940Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00471 40th percentileScored 2026-11-07
Fix Fixed WhatsApp for Android (Facebook): 2.26.7.10WhatsApp for iOS (Facebook): 2.26.15.72
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Meta | WhatsApp for Android | 2.25.8.0 to before 2.26.7.10 | 2.26.7.10 | Patch available | CNA |
| Meta | WhatsApp for iOS | 2.25.8.0 to before 2.26.15.72 | 2.26.15.72 | Patch available | CNA |
Remediation
- Fix · CNA WhatsApp for Android (Facebook) Fixed in 2.26.7.10
- Fix · CNA WhatsApp for iOS (Facebook) Fixed in 2.26.15.72
Timeline
- 2026-10-02 Threatist record created from CVE-2026-23866
- 2026-10-03 Alias added: GHSA-4x7f-p792-g362
References
More Meta vulnerabilities
- TI-2025-34861 Deserialization of untrusted data in Meta react-server-dom-webpack KEVCVSS 3.1CRITICAL 10.0
- TI-2019-02633 Heap-based buffer overflow in Meta WhatsApp for Android KEVCVSS 3.1CRITICAL 9.8
- TI-2019-13416 Cross-site scripting in Meta WhatsApp Desktop KEVCVSS 3.1HIGH 8.2
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2025-34857 Incorrect authorization in Meta WhatsApp Desktop for Mac KEVCVSS 3.1MEDIUM 5.4
- TI-2025-34863 Deserialization of untrusted data in Meta react-server-dom-webpack CVSS 3.1HIGH 7.5
Sources
- CVE-2026-23866 · CVE Program
- CVE-2026-23866 · NVD
- FIRST EPSS
- GHSA-4x7f-p792-g362 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences