EmbedVideo Extension: Stored XSS via unsanitized service name in exception text
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
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, 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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| StarCitizenWiki | mediawiki-extensions-EmbedVideo | before 4.1.0 | 4.1.0 | Patch available | CNA |
| — | starcitizenwiki/embedvideo (Packagist) | before 4.1.0 | 4.1.0 | Patch available | GHSA-c29q-5xm7-5p62 |
- mediawiki-extensions-EmbedVideo VendorStarCitizenWiki Affected before 4.1.0 Fixed in 4.1.0 Patch available CNA
- starcitizenwiki/embedvideo (Packagist) Vendor— Affected before 4.1.0 Fixed in 4.1.0 Patch available GHSA-c29q-5xm7-5p62
Remediation
- Fix · CNA mediawiki-extensions-EmbedVideo (StarCitizenWiki) Fixed in 4.1.0
- Fix · GHSA-c29q-5xm7-5p62 starcitizenwiki/embedvideo (Packagist) Fixed in 4.1.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55690
- 2026-10-03 Alias added: GHSA-c29q-5xm7-5p62
References
Other 4
- 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/releases/tag/v4.1.0
- https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo
More StarCitizenWiki vulnerabilities
- TI-2026-40206 EmbedVideo Extension : Stored XSS via unsanitized class passed to template CVSS 3.1HIGH 8.6
- TI-2026-41377 Mediawiki EmbedVideo Extension has stored XSS via malformed src url with $wgEmbedVideoRequireConsent disabled CVSS 3.1HIGH 7.5
- TI-2026-40207 EmbedVideo Extension: Stored XSS via malformed src url with $wgEmbedVideoRequireConsent enabled CVSS 3.1HIGH 7.5
Sources
- CVE-2026-55690 · CVE Program
- CVE-2026-55690 · NVD
- FIRST EPSS
- GHSA-c29q-5xm7-5p62 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences