CVE-2025-53487

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

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.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Affected: Wikimedia Foundation Mediawiki - ApprovedRevs extension
Published at:
Updated at:

References

Link Tags
https://phabricator.wikimedia.org/T394383
https://gerrit.wikimedia.org/r/q/Ifcab085111e7898da485a5e2ae287fee4e6d167b

Frequently Asked Questions

What is the severity of CVE-2025-53487?
CVE-2025-53487 has been scored as a medium severity vulnerability.
How to fix CVE-2025-53487?
To fix CVE-2025-53487, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-53487 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-53487 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-53487?
CVE-2025-53487 affects Wikimedia Foundation Mediawiki - ApprovedRevs extension.
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