{"id":"CVE-2026-55691","title":"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","summary":"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/Embed…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","cwe":["CWE-79","CWE-80"],"vendor":"StarCitizenWiki","product":"mediawiki-extensions-EmbedVideo","affected":["mediawiki-extensions-EmbedVideo < 4.1.0"],"patched":["starcitizenwiki/embedvideo 4.1.0"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T16:17:10.127","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55691","references":[{"url":"https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/370156335b325bb81d14d89edf0a1f2643d50a84","label":"security-advisories@github.com"},{"url":"https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/releases/tag/v4.1.0","label":"security-advisories@github.com"},{"url":"https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-7h5p-637f-jfr7","label":"security-advisories@github.com"},{"url":"https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-7h5p-637f-jfr7","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-7h5p-637f-jfr7"}],"tags":["nvd","cve.org","exploit-available","ghsa","composer"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-16T15:44:19.616396Z"},"ecosystem":"composer","ingestedAt":"2026-06-22T13:35:24.377Z","epss":0.00484,"epssPercentile":0.39045,"slug":"CVE-2026-55691","body":"## Overview\n\nThe 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55691)\n\nAffected packages:\n\n- `starcitizenwiki/embedvideo <= 4.0.0`\n\nPatched in:\n\n- `starcitizenwiki/embedvideo 4.1.0`\n\nSource: https://github.com/advisories/GHSA-7h5p-637f-jfr7","depth":"midnight","depthScore":59,"depthScoreParts":{"impact":47.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":205354,"id":"CVE-2026-55691","ts":1789574378744,"field":"exploit_available","old":"false","new":"true"}]}