CVE-2026-55692: Starcitizenwiki Mediawiki-Extensions-Embedvideo

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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, with the default $wgEmbedVideoRequireConsent configuration enabled, includes/EmbedService/EmbedHtmlFormatter.php places JSON returned through includes/EmbedService/AbstractEmbedService.php into the data-mw-iframeconfig attribute without safely escaping single quotes. Attacker-controlled archiveorg identifiers and wistia or sharepoint URLs accepted by the affected service validators can cause getUrl() output to terminate the attribute and inject event-handler attributes into the generated figure element. A user able to edit a wiki page can store JavaScript that executes in the wiki origin when visitors render the page. This issue is fixed in version 4.1.0.

Affected products

• Starcitizenwiki Mediawiki-Extensions-Embedvideo: before 4.1.0 (fixed in 4.1.0)

Published 2026-09-15. Last modified 2026-09-30.