4.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-50183

CVE-2026-50183: WWBN AVideo: Stored XSS via Hostile YouTube Video Title in AVideo YouTubeAPI Gallery Section

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.

(GitHub Advisory)

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CVE-2026-50183

CVE-2026-50183:

4.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation pocAutomatable NoTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
WWBN/AVideo	composer	<= 29.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a stored Cross-Site Scripting (XSS) issue in the AVideo YouTubeAPI plugin. The root cause is twofold: first, the YouTubeAPI::listVideos function in plugin/YouTubeAPI/YouTubeAPI.php fetches video information, including the title, from the YouTube Data API and stores it without any sanitization. This makes the application trust user-controllable data from YouTube. Second, the plugin/YouTubeAPI/gallerySection.php script renders this title directly into the HTML of the gallery page without proper encoding, leading to the XSS vulnerability. The provided patch addresses the issue at the sink, in gallerySection.php, by applying htmlspecialchars to the video title and thumbnails before they are displayed. This prevents the browser from interpreting the malicious title as code. While the patch is in gallerySection.php, the function YouTubeAPI::listVideos is the source of the tainted data and is an essential part of the vulnerability chain.

Vulnerable functions

gallerySection.php

plugin/YouTubeAPI/gallerySection.php

This PHP script is vulnerable to stored Cross-Site Scripting (XSS). It includes the vulnerable code that renders video titles from YouTube without proper HTML encoding. An attacker can create a YouTube video with a malicious title containing JavaScript. When the AVideo gallery displays this video, the script executes in the visitor's browser. The file `gallerySection.php` acts as the sink for this vulnerability, where the unescaped data is rendered.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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