6.1

CVE-2025-11261: mediawiki Cross-site Scripting

CVSS: 6.1v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2025-11261DEBIAN-CVE-2025-11261
Published 03-02-2026Last modified 03-02-2026
Open JSON

Vulnerability summary

CVE-2025-11261 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in mediawiki. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.9% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.26%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3
DLA-4355-1DSA-6085-1MGASA-2025-0260

Timeline

  1. 03-02-2026
    PublishedVulnerability first disclosed.
  2. 03-02-2026
    Last modifiedVulnerability information updated.

Description

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.Language/mediawiki.Language.Js. This issue affects MediaWiki: from * before 1.39.15, 1.43.5, 1.44.2.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

+0.03 pp

From 0.23% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.26%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • mediawiki< 1:1.39.17-1~deb12u1 | < 1:1.43.6+dfsg-1~deb13u1 | < 1:1.43.5+dfsg-1
Mediawiki1 product
  • mediawiki< 1.39.15 | ≥ 1.43.0, < 1.43.5 | ≥ 1.44.0, < 1.44.2
Ubuntu1 product
  • mediawikiAll versions (No fix recorded)
Wikimedia foundation1 product

4 vendors · 4 products

References

7 links