CVE-2026-34247: AVideo: IDOR in uploadPoster.php Allows Any Authenticated User to Overwrite Scheduled Live Stream Posters and Trigger False Socket Notifications

March 29, 2026

The plugin/Live/uploadPoster.php endpoint allows any authenticated user to overwrite the poster image for any scheduled live stream by supplying an arbitrary live_schedule_id. The endpoint only checks User::isLogged() but never verifies that the authenticated user owns the targeted schedule. After overwriting the poster, the endpoint broadcasts a socketLiveOFFCallback notification containing the victim’s broadcast key and user ID to all connected WebSocket clients.

References

github.com/WWBN/AVideo
github.com/WWBN/AVideo/commit/5fcb3bdf59f26d65e203cfbc8a685356ba300b60
github.com/WWBN/AVideo/security/advisories/GHSA-g3hj-mf85-679g
github.com/advisories/GHSA-g3hj-mf85-679g
nvd.nist.gov/vuln/detail/CVE-2026-34247

Code Behaviors & Features

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