CVE-2025-53478

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

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.

Category

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

References

Link Tags
https://phabricator.wikimedia.org/T394692
https://gerrit.wikimedia.org/r/q/I3a1e21b6800ff4d813a33ee9fe9b7ccf070b6b2e

Frequently Asked Questions

What is the severity of CVE-2025-53478?
CVE-2025-53478 has been scored as a medium severity vulnerability.
How to fix CVE-2025-53478?
To fix CVE-2025-53478, 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-2025-53478 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-53478 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-2025-53478?
CVE-2025-53478 affects Wikimedia Foundation Mediawiki - CheckUser extension.
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