EmbedVideo Extension: Stored XSS via malformed src url with $wgEmbedVideoRequireConsent enabled
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, with the default $wgEmbedVideoRequireConsent configuration enabled, includes/EmbedService/EmbedHtmlFormatter.php places JSON returned through includes/EmbedService/AbstractEmbedService.php into the data-mw-iframeconfig attribute without safely escaping single quotes. Attacker-controlled archiveorg identifiers and wistia or sharepoint URLs accepted by the affected service validators can cause getUrl() output to terminate the attribute and inject event-handler attributes into the generated figure element. A user able to edit a wiki page can store JavaScript that executes in the wiki origin when visitors 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
- Poc
- 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-5c7p-g73q-rpg5 |
- 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-5c7p-g73q-rpg5
Remediation
- Fix · CNA mediawiki-extensions-EmbedVideo (StarCitizenWiki) Fixed in 4.1.0
- Fix · GHSA-5c7p-g73q-rpg5 starcitizenwiki/embedvideo (Packagist) Fixed in 4.1.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55692
- 2026-10-03 Alias added: GHSA-5c7p-g73q-rpg5
References
Other 4
- https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/GHSA-5c7p-g73q-rpg5
- https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/370156335b325bb81d14d89edf0a1f2643d50a84
- 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-2026-40205 EmbedVideo Extension: Stored XSS via unsanitized service name in exception text CVSS 3.1HIGH 7.5
Sources
- CVE-2026-55692 · CVE Program
- CVE-2026-55692 · NVD
- FIRST EPSS
- GHSA-5c7p-g73q-rpg5 · 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