Vulnerability · Published Jul 7, 2025 · Assigned by wikimedia-foundation

CVE-2025-53478CheckUser: Reflected Cross-Site Scripting (XSS) in Special:Investigate via unsanitized i18n messages

Medium 5.4

In plain English

A medium-severity cross-site scripting in Mediawiki - CheckUser extension 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 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 90.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

The CheckUser extension’s Special:Investigate interface is vulnerable to reflected XSS due to improper escaping of certain internationalized system messages rendered on the “IPs and User agents” tab. This issue affects Mediawiki - CheckUser extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.

Affected products (as reported)

Vendor	Product	Versions
Wikimedia Foundation	Mediawiki - CheckUser extension	1.39.x – before 1.39.131.42.x – before 1.42.71.43.x – before 1.43.2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

In plain English

Official description

Affected products (as reported)

References