CVE-2026-23866

MediumCVSS 4.3/10Last modified Oct 26, 2026

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.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-940

Affected software

Vendor	Product	Versions
Facebook	WhatsApp for Android	>= 2.25.8.0, < 2.26.7.10
Facebook	WhatsApp for iOS	>= 2.25.8.0, < 2.26.15.72

References

https://www.facebook.com/security/advisories/cve-2026-23866Third Party Advisory
https://www.whatsapp.com/security/advisories/2026Vendor Advisory

Timeline

Published: May 1, 2026
Last modified: Oct 26, 2026
NVD status: Analyzed

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