XSS in Wwbn Avideo
CVE-2026-89256
AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the Bookmark plugin where chapter names are not encoded before being concatenated into public watch-page HTML. A video owner can inject malicious scripts via the bookmark name parameter, and every visitor of that video executes the payload in the AVideo origin.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/WWBN/AVideo/security/advisories/GHSA-jggq-mm5m-r5wv (vendor-advisory)
- www.vulncheck.com/advisories/avideo-bookmark-plugin-stored-xss-via-chapter-names (third-party-advisory)
Frequently asked questions
- What is CVE-2026-89256?
- CVE-2026-89256 is a high-severity vulnerability in Wwbn Avideo, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-09-11.
- How severe is CVE-2026-89256?
- High severity. CVSS v3 base score is 8.7 out of 10.