CVE Catalog

CVE-2026-50183

MediumCVSS 4.7
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.16%

6th percentile - higher than 6% of all known CVEs

Summary

Stored Cross-Site Scripting (XSS) vulnerability in the YouTubeAPI plugin of AVideo (versions 29.0 and below). An attacker can inject malicious JavaScript by setting a YouTube video title, which is then rendered on the AVideo homepage without HTML encoding.

Risk Assessment

Risk of full administrative takeover of AVideo. The malicious code executes in every visitor's browser; for administrators, it can perform any admin action (e.g., create user, change configuration) without additional CSRF token.

Recommendation

Immediately update AVideo to a version containing the fix (commit 7292129eaee5f609beae103b5cb387d55f17b877) or disable the YouTubeAPI plugin as a workaround until the update is applied.

Other vulnerabilities in AVideo

See all
Original NVD description (English source)

WWBN AVideo is an open source video platform. Versions 29.0 and below contain a stored Cross-Site Scripting vulnerability in the YouTubeAPI plugin. The plugin renders the snippet.title field returned by the YouTube Data API into the homepage gallery markup with no HTML encoding. The title is set by the YouTube video uploader (anyone in the world) and is treated by AVideo as trusted content. A YouTube uploader who controls a video matching the operator's configured query injects HTML into the AVideo homepage by setting their video's title to a JavaScript-bearing string; the payload then executes in the browser of every visitor who loads any page that renders the gallery. When the visitor is an AVideo administrator, the injected JavaScript performs any admin action (create user, promote to admin, change configuration, install plugin) that uses cookie-based authentication without an additional CSRF token, escalating the bug into full administrative takeover. The payload persists for the duration of cacheTimeout (default 3600 seconds) after the malicious title is set on YouTube and survives YouTube removing the hostile video for the same window. This issue has been addressed by commit https://github.com/WWBN/AVideo/commit/7292129eaee5f609beae103b5cb387d55f17b877.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS