PatchTheCVECVE-2025-59839: The EmbedVideo Extension is a MediaWiki extension which adds a parser function called #ev and various parser t
CVE-2025-59839 is a high-severity flaw (CVSS 8.6) affecting embedvideo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.6 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 76%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2025-09-25 |
| Last modified | 2026-10-11 |
Last updated 2026-10-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-59839?
embedvideo: upgrade to newer than 4.0.0. Exact commands for each OS are on this page.
Is CVE-2025-59839 being exploited?
CVE-2025-59839 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-59839 affect?
CVE-2025-59839 affects embedvideo. Severity is high (CVSS 8.6). 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 ad
How urgent is CVE-2025-59839?
Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action