How severe is CVE-2025-59839?

CVE-2025-59839 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2025-59839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59839?

CVE-2025-59839 affects Star-citizen Embedvideo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59839?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-59839 have an EU (EUVD) identifier?

Yes. CVE-2025-59839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31038.

When was CVE-2025-59839 published?

CVE-2025-59839 was published on 2025-09-25 and last updated on 2026-06-17.

CVE-2025-59839

CVE-2025-59839 is a high-severity vulnerability in Star-citizen Embedvideo with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-31038
Weakness: CWE-79
Affected product: Star-citizen Embedvideo
Published: 2025-09-25
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-59839?: CVE-2025-59839 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2025-59839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59839?: CVE-2025-59839 affects Star-citizen Embedvideo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-59839 have an EU (EUVD) identifier?: Yes. CVE-2025-59839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31038.
When was CVE-2025-59839 published?: CVE-2025-59839 was published on 2025-09-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:star-citizen:embedvideo:*:*:*:*:*:mediawiki:*:*

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