VULNERABILITY INTELLIGENCE

CVE-2026-23866

CVSS score4.3 MEDIUM
EPSS probability0.47%
CISA KEVNot currently listed
Published2026-05-01
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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.

Weakness classification

  • CWE-940: Improper Verification of Source of a Communication Channel

Primary references