Vulnerability details

CVE-2026-89256

WWBN AVideo

AVideo Bookmark Plugin Stored XSS via Chapter Names

CVSS 4.0

9.3Critical

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.

CVSS scores

Score	Version	Source	Vector
9.3Critical	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N`
8.7High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
WWBN	AVideo	v ≤ c3edcc274c389816d434acadac07ee78eaf330c1	CVEProject cvelistV5 (CNA)

References and advisories

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

Kolun on Telegram @kolunsec Exploited CVEs, key news and a daily digest Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.

Details

Published: 2026-09-11
Last updated: 2026-09-11
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.36%

Probability of exploitation in 30 days

30.6%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Total

Weaknesses (CWE)

CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')