Input validation error in WhatsApp Messenger for iOS and WhatsApp Messenger for Android - CVE-2026-23866

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU130236

Input validation error in WhatsApp Messenger for iOS and WhatsApp Messenger for Android - CVE-2026-23866

Published: May 6, 2026


Vulnerability identifier: #VU130236
CSH Severity: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-23866
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
WhatsApp Messenger for iOS
WhatsApp Messenger for Android
Software vendor:
WhatsApp

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of AI rich response messages for Instagram Reels. A remote attacker can force the application into processing of media content from an arbitrary URL on another user’s device, including triggering OS-controlled custom URL scheme handlers.


Remediation

Install updates from vendor's website.

External links