CVE-2026-23866

MEDIUM

4.3

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.

CVE Details

CVSS v3.1 Score4.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published5/1/2026

Last Modified5/4/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-940

References

https://www.facebook.com/security/advisories/cve-2026-23866(cve-assign@fb.com)

https://www.whatsapp.com/security/advisories/2026(cve-assign@fb.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.