Auth bypass in Wwbn Avideo
CVE-2026-34247
WWBN AVideo is an open source video platform. In versions up to and including 26.0, 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. Commit 5fcb3bdf59f26d65e203cfbc8a685356ba300b60 fixes the issue.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (17.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Wwbn Avideo — versions <= 26.0
Weakness classification (CWE)
References
- github.com/WWBN/AVideo/security/advisories/GHSA-g3hj-mf85-679g (Exploit, Vendor Advisory)
- github.com/WWBN/AVideo/commit/5fcb3bdf59f26d65e203cfbc8a685356ba300b60 (Patch)
Frequently asked questions
- What is CVE-2026-34247?
- CVE-2026-34247 is a medium-severity vulnerability in Wwbn Avideo, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-03-27.
- How severe is CVE-2026-34247?
- Medium severity. CVSS v3 base score is 5.4 out of 10.