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Description

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.

PUBLISHED Reserved 2026-01-16 | Published 2026-05-01 | Updated 2026-05-01 | Assigner Meta




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C

Problem types

Improper Verification of Source of a Communication Channel (CWE-940)

Product status

Default status
unaffected

2.25.8.0 (semver) before 2.26.7.10
affected

Default status
unaffected

2.25.8.0 (semver) before 2.26.15.72
affected

References

www.facebook.com/security/advisories/cve-2026-23866

www.whatsapp.com/security/advisories/2026

cve.org (CVE-2026-23866)

nvd.nist.gov (CVE-2026-23866)

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