SB2026050625 - Incomplete validation of AI rich response messages for Instagram Reels in WhatsApp for iOS and Android
Published: May 6, 2026
Security Bulletin ID
SB2026050625
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2026-23866)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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
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 update from vendor's website.