{"id":"GHSA-c29q-5xm7-5p62","aliases":["CVE-2026-55690"],"title":"StarCitizenWiki Extension Embed Video: Stored XSS via unsanitized service name in exception text","description":"### Summary\nWhen passing an unknown service name to embedvideo, an error message is rendered containing the invalid service name. The service name is not sanitized and can contain HTML.\n\n### Details\nThere is a hardcoded list of allowed services in a switch statement inside `EmbedServiceFactory#newFromName` [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedService/EmbedServiceFactory.php#L105). When the service name is not known, an exception is thrown with the service name injected into the message via sprintf [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedService/EmbedServiceFactory.php#L286). This message is not sanitized and is marked as isHtml [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedVideo.php#L303-L311). Similarly with `{{evl:` [here](https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/a573a16d925ee0ea0d34b360856dc8ab0b88f822/includes/EmbedVideo.php#L177-L183).\n\n### PoC\n```\n// Must be on a page, not on ExpandTemplates\n{{#ev:<img src=x onerror=alert(document.domain)>|dQw4w9WgXcQ}}\n{{#evl:id=dummy|service=<img src=x onerror=alert(document.domain)>}}\n```\n\n### Impact\nStored XSS that allows arbitrary Javascript/HTML insertion on any page that a user can edit.  It requires no interaction and executes in the wiki origin for every visitor to the page.","severity":"high","score":7.5,"published":"2026-06-19T21:14:15.000Z","modified":"2026-09-10T03:50:55.301Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"starcitizenwiki/embedvideo","ranges":[{"events":[{"introduced":"0"},{"fixed":"4.1.0"}],"type":"ECOSYSTEM"}],"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"],"fixed":["4.1.0"]}],"references":["https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-c29q-5xm7-5p62","https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/9215564bf28a0ceb40be550a55ab78efc0accc56","https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo","https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/releases/tag/v4.1.0"],"sources":[{"name":"OSV","id":"GHSA-c29q-5xm7-5p62","modified":"2026-09-10T03:50:55.301470284Z","url":"https://osv.dev/vulnerability/GHSA-c29q-5xm7-5p62"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5}]}