CVE-2026-23866: WhatsApp

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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

• WhatsApp WhatsApp: from 2.25.8.0, up to and including 2.26.7.10; from 2.25.8.0, up to and including 2.26.15.72

Published 2026-05-01. Last modified 2026-06-17.