Vulnerability intelligence

CVE-2026-23866

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.

CVSS Score

4.3

Medium

EPSS — Exploit Probability

0.5%

Riskier than 38% of all CVEs

Exploitation

Not in CISA KEV

No federal exploitation record

Remediation

unknown

Check vendor advisories

NVD entry PoC / advisory

1 article across 1 outlet · first covered May 5, 2026 · latest May 5, 2026

Coverage timeline

WhatsApp fixes attachment spoof and AI mediated URL bug
www.securityweek.com · May 5, 2026