Vulnerability Description
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, EmbedServiceFactory::newFromName in includes/EmbedService/EmbedServiceFactory.php interpolates an attacker-controlled unknown service name into exception text, and includes/EmbedVideo.php returns that text as HTML through the isHtml output path without neutralization. Both the #ev parser function and the evl parser form can reach this error path. A user able to edit a wiki page can inject stored HTML or JavaScript into the error output, causing code to execute in the wiki origin for visitors who render the page. This issue is fixed in version 4.1.0.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/921556
- https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/releases/tag/
- https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advi
FAQ
What is CVE-2026-55690?
CVE-2026-55690 is a vulnerability with a CVSS score of 7.5 (HIGH). 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, EmbedSe...
How severe is CVE-2026-55690?
CVE-2026-55690 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55690?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.