Vulnerability · Published Sep 11, 2026 · Assigned by VulnCheck
CVE-2026-89256AVideo Bookmark Plugin Stored XSS via Chapter Names
High 8.7
In plain English
A high-severity cross-site scripting in AVideo from WWBN. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).
Severity (CVSS 3.1)8.7High
Exploit odds (30 days)0.4%top 69.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
References
- GitHub Security Advisory (GHSA-jggq-mm5m-r5wv) vendor-advisory
- VulnCheck Advisory: AVideo Bookmark Plugin Stored XSS via Chapter Names third-party-advisory