What is CVE-2025-61637?

CVE-2025-61637 is a medium-severity vulnerability in Mediawiki, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-02-03.

How severe is CVE-2025-61637?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Mediawiki

CVE-2025-61637

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.Action/mediawiki.Action.Edit.Preview.Js, resources/src/mediawiki.Page.Preview.Js. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (12.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Permissions Required)

Frequently asked questions

What is CVE-2025-61637?: CVE-2025-61637 is a medium-severity vulnerability in Mediawiki, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-02-03.
How severe is CVE-2025-61637?: Medium severity. CVSS v3 base score is 4.8 out of 10.