4.8

CVE-2025-61638: mediawiki Cross-site Scripting

CVSS: 4.8v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2025-61638DEBIAN-CVE-2025-61638
Published 02-02-2026Last modified 03-02-2026
Open JSON

Vulnerability summary

CVE-2025-61638 is a medium (CVSS 4.8) Cross-site Scripting vulnerability in mediawiki. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.4% of scored vulnerabilities.

Overall risk
19/100
0100
Low · default modelHow is this calculated?
CVSS score
4.8/10
010
Medium · v3.1 (NVD)
EPSS score
0.27%
0%100%
Low · +0.02 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. 02-02-2026
    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, 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.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

+0.02 pp

From 0.25% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.27%

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

Wikimedia foundation2 products
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< 1.39.14 | ≥ 1.39.15, < 1.43.4 | ≥ 1.43.5, < 1.44.1
Ubuntu1 product
  • mediawikiAll versions (No fix recorded)
Wikimedia1 product
  • parsoid< 0.16.6 | > 0.16.6, < 0.20.4 | > 0.20.4, < 0.21.1

5 vendors · 6 products

References

6 links