XSS in Star-Citizen Embedvideo
CVE-2025-59839
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. In versions 4.0.0 and prior, the EmbedVideo extension allows adding arbitrary attributes to an HTML element, allowing for stored XSS through wikitext. This issue has been patched via commit 4e075d3.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (20.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Star-Citizen Embedvideo
- Starcitizenwiki Mediawiki-Extensions-Embedvideo — versions <= 4.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/security/advisories/… (Exploit, Vendor Advisory)
- github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/commit/4e075d3dc9a15… (Patch)
- github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b205… (Product)
- github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b205… (Product)
Frequently asked questions
- What is CVE-2025-59839?
- CVE-2025-59839 is a high-severity vulnerability in Star-Citizen Embedvideo, classified under Cross-site Scripting. CVSS score: 8.6/10. Published 2025-09-25.
- How severe is CVE-2025-59839?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2025-59839 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.