What is CVE-2025-6594?

CVE-2025-6594 is a medium-severity vulnerability in Wikimedia Foundation MediaWiki, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-02-02.

How severe is CVE-2025-6594?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Is CVE-2025-6594 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Wikimedia Foundation MediaWiki

CVE-2025-6594

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files resources/src/mediawiki.Special.Apisandbox/ApiSandbox.Js. This issue affects MediaWiki: from 1.27.0 before 1.39.13, 1.42.7 1.43.2, 1.44.0.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (19.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N.

Affected products

Wikimedia Foundation Mediawiki — versions 1.27.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

w4zu/Debian_

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

Frequently asked questions

What is CVE-2025-6594?: CVE-2025-6594 is a medium-severity vulnerability in Wikimedia Foundation MediaWiki, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-02-02.
How severe is CVE-2025-6594?: Medium severity. CVSS v3 base score is 4.7 out of 10.
Is CVE-2025-6594 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.