p PatchFirst

CVE-2026-55691

CVE-2026-55691 · EmbedVideo Extension : Stored XSS via unsanitized class passed to template

This page contains facts from public vulnerability sources. Check the original advisory before updating.

The EmbedVideo Extension is a MediaWiki extension which adds a parser function called #ev and various parser tags for embedding video clips from various video sharing services. Prior to 4.1.0, EmbedHtmlFormatter::toHtml in includes/EmbedService/EmbedHtmlFormatter.php passes the user-supplied class value directly to sprintf while constructing a figure element. A quote in the class value can terminate the class attribute and inject arbitrary HTML attributes or markup into the rendered page. A user able to edit a wiki page can store JavaScript that executes for visitors who render the affected content. This issue is fixed in version 4.1.0.

CVSS 8.6 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: php

Affected products and versions

  • mediawiki-extensions-embedvideo

    Versions
    • < 4.1.0: Affected

    No fix published

  • starcitizenwiki/embedvideo Packagist

    Versions
    • 3.0.0
    • 3.0.1
    • 3.0.2
    • 3.0.3
    • 3.0.4
    • 3.0.5
    • 3.0.6
    • 3.0.7
    • 3.0.8
    • 3.0.9
    • 3.1.0
    • 3.2.0
    • 3.2.1
    • 3.2.2
    • 3.2.3
    • 3.2.4
    • 3.2.5
    • 3.2.6
    • 3.2.7
    • 3.2.8
    • 3.3.0
    • 3.4.0
    • 3.4.1
    • 3.4.2
    • 3.4.3
    • 4.0.0
    Affected ranges
    • ECOSYSTEM: < 4.1.0

    Update to 4.1.0

Original sources

Check your server →