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0.0

Wikimedia CheckUser allows malicious code execution

CVE-2026-58034 · published 4 months ago
Summary

A security issue in Wikimedia Foundation's CheckUser software allows attackers to inject malicious code into a webpage. This could lead to unauthorized actions or data theft on Wikimedia sites. Users should update to the latest version of CheckUser to fix this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
mediawiki mediawiki 1.46.0
cpe:2.3:a:mediawiki:mediawiki:1.46.0:rc0:*:*:*:*:*:*
Original advisory text
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 mo...
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.TempAccounts/components/blockConnectedTempAccountsField.Vue.



This issue affects CheckUser: from 1.46.0-rc.0 before 1.46.0.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
0.0 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published1 Jul 2026
Updated3 Nov 2026
First seen1 Jul 2026
Sources
CVE-2026-58034 · NVD
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