CSRF in Wwbn Avideo
CVE-2026-40929
WWBN AVideo is an open source video platform. In versions 29.0 and prior, `objects/commentDelete.json.php` is a state-mutating JSON endpoint that deletes comments but performs no CSRF validation. It does not call `forbidIfIsUntrustedRequest()`, does not verify a CSRF/global token, and does not check `Origin`/`Referer`. Because AVideo intentionally sets `session.cookie_samesite=None` (to support cross-origin embed players), a cross-site request from any attacker-controlled page automatically carries the victim's `PHPSESSID`. Any authenticated victim who has authority to delete one or more comments (site moderators, video owners, and comment authors) can be tricked into deleting comments en masse simply by visiting an attacker page. Commit 184f36b1896f3364f864f17c1acca3dd8df3af27 contains a fix.
Vulnerability class: CSRF (Cross-Site Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.001 (3.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Wwbn Avideo — versions <= 29.0
Weakness classification (CWE)
References
- github.com/WWBN/AVideo/security/advisories/GHSA-8qm8-g55h-xmqr (Exploit, Mitigation, Vendor Advisory)
- github.com/WWBN/AVideo/commit/184f36b1896f3364f864f17c1acca3dd8df3af27 (Patch)
Frequently asked questions
- What is CVE-2026-40929?
- CVE-2026-40929 is a medium-severity vulnerability in Wwbn Avideo, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-04-21.
- How severe is CVE-2026-40929?
- Medium severity. CVSS v3 base score is 5.4 out of 10.