What’s Vulnerable › Vulnerabilities
CVE-2025-61651: i18n XSS through Special:CheckUser CheckUser helper
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-03 · updated 2026-06-17
- Weakness: CWE-79
Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files modules/ext.CheckUser/checkuser/checkUserHelper/buildUserElement.Js. This issue affects CheckUser: from * before 1.44.1.
Affected products
- Wikimedia Foundation CheckUser: before 1.44.1 — fixed in 1.44.1
How to fix
Upgrade to a fixed version: Wikimedia Foundation CheckUser 1.44.1. Check the vendor advisory for mitigations.
References
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