CVE-2026-89256: AVideo Bookmark Plugin Stored XSS via Chapter Names

Severity: high (CVSS 8.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-11 · updated 2026-09-11
Weakness: CWE-79

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.

References

https://github.com/WWBN/AVideo/security/advisories/GHSA-jggq-mm5m-r5wv
https://www.vulncheck.com/advisories/avideo-bookmark-plugin-stored-xss-via-chapter-names
https://github.com/WWBN/AVideo/security/advisories/GHSA-jggq-mm5m-r5wv

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