CVE-2026-55691
Published:September 15, 2026
Updated:September 22, 2026
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 Packages
https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo.git (GITHUB):
Affected version(s) >=v1.0 <v4.1.0Fix Suggestion:
Update to version v4.1.0starcitizenwiki/embedvideo (PHP):
Affected version(s) >=dev-ci-js <4.1.0Fix Suggestion:
Update to version 4.1.0starcitizenwiki/embedvideo (PHP):
Affected version(s) >=dev-ci-js <4.1.0Fix Suggestion:
Update to version 4.1.0Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
EPSS
Base Score:
0.29