CVE-2026-63305 WWBN CVE debrief

Who should care

Administrators and users of AVideo, especially those using version 29.0 or earlier, should be aware of this critical vulnerability. The vulnerability's high CVSS score of 9.2 indicates its severity, and immediate action is recommended to mitigate potential risks.

Technical summary

The vulnerability is caused by the insecure handling of user input in the ffmpeg.json.php endpoint. Specifically, the notifyCode and callback parameters are concatenated into a shell command without proper escaping, allowing for OS command injection. Attackers can exploit this by crafting a valid encrypted payload with malicious shell metacharacters, leading to arbitrary OS command execution as the web-server user.

Defensive priority

High

Recommended defensive actions

• Update AVideo to a version beyond 29.0, if available, or apply vendor-recommended patches.
• Implement input validation and output encoding for user-supplied data in the ffmpeg.json.php endpoint.
• Monitor the system for suspicious activity, such as unexpected OS commands or shell processes.
• Consider using a web application firewall (WAF) to detect and prevent common web attacks.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record was published on 2026-07-16T13:16:33.460Z and last modified on 2026-07-16T13:45:55.687Z. The NVD entry is currently Deferred. Limited information is available about the vendor's remediation efforts or affected scope.

Official resources