Vulnerability · Published Feb 2, 2026 · Assigned by wikimedia-foundation
CVE-2025-61637Stored XSS through system messages in MW Core
None 0.0
In plain English
A cross-site scripting in MediaWiki from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | mediawiki | 1:1.43.6+dfsg-1~deb13u1 | DEBIAN-CVE-2025-61637 |
| Debian:14 | mediawiki | 1:1.43.5+dfsg-1 | DEBIAN-CVE-2025-61637 |
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2025-61637 |
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2025-61637 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2025-61637 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wikimedia Foundation | MediaWiki | * – before 1.39.14, 1.43.4, 1.44.1 |
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U