CVE-2026-23866 json
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 Androi…
published 2026-05-01 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-26666
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 41%
- public exploits
- 0
- none known
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.
Patch / fix
- Facebook WhatsApp for Android 2.26.7.10
- Facebook WhatsApp for iOS 2.26.15.72
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | 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 |
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected products
- Facebook WhatsApp for Android
- Facebook WhatsApp for iOS
Classification
- Weakness
-
- CWE-940 Improper Verification of Source of a Communication Channel
References
-
whatsapp.com
/security/advisories/2026
vendor-advisory
-
facebook.com
/security/advisories/cve-2026-23866
third-party-advisory
Sources
- CVE List CVE-2026-23866
- NVD CVE-2026-23866
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