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CVE-2026-55691

EmbedVideo Extension : Stored XSS via unsanitized class passed to template PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
StarCitizenWiki / mediawiki-extensions-EmbedVideoaffected < 4.1.0

CWE

CWE-79

References

ADP enrichment

CISA-ADP

No English description supplied.