Medium severity · published Jul 7, 2025
CVE-2025-53487
ApprovedRevs: Stored Cross-Site Scripting (XSS) via unsanitized system messages
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mediawiki - ApprovedRevs extension · Wikimedia Foundation
1.39.x before 1.39.13; 1.42.x before 1.42.7; 1.43.x before 1.43.2 · source: vendor
Affected product
MA
Mediawiki - ApprovedRevs extension
Wikimedia Foundation