What is CVE-2025-61638?

CVE-2025-61638 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-2025-61638?

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

Is CVE-2025-61638 known to be exploited?

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

XSS in Mediawiki

CVE-2025-61638

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki, Wikimedia Foundation Parsoid. This vulnerability is associated with program files includes/parser/Sanitizer.Php, src/Core/Sanitizer.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1; Parsoid: from * before 0.16.6, 0.20.4, 0.21.1.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (14.4th 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

Public proof-of-concept exploits

gui-ying233/CVE-2025-61638

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Third Party Advisory)

Frequently asked questions

What is CVE-2025-61638?: CVE-2025-61638 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-2025-61638?: Medium severity. CVSS v3 base score is 4.8 out of 10.
Is CVE-2025-61638 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.