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

CVE-2025-53487ApprovedRevs: Stored Cross-Site Scripting (XSS) via unsanitized system messages

Medium 5.4

In plain English

A medium-severity cross-site scripting in Mediawiki - ApprovedRevs 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 ApprovedRevs extension for MediaWiki is vulnerable to stored XSS in multiple locations where system messages are inserted into raw HTML without proper escaping. Attackers can exploit this by injecting JavaScript payloads via the uselang=x-xss language override, which causes crafted message keys to be rendered unescaped. This issue affects Mediawiki - ApprovedRevs 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 - ApprovedRevs 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