CVE-2026-58034
Received Received - Intake

Cross-Site Scripting in Wikimedia CheckUser

Publication date: 2026-07-01

Last updated on: 2026-07-01

Assigner: wikimedia-foundation

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.TempAccounts/components/blockConnectedTempAccountsField.Vue. This issue affects CheckUser: from 1.46.0-rc.0 before 1.46.0.

CVSS Scores

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Meta Information

Published
2026-07-01
Last Modified
2026-07-01
Generated
2026-07-01
AI Q&A
2026-07-01
EPSS Evaluated
N/A
NVD
CVE-2026-58034
EUVD
EUVD-2026-41011

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wikimedia_foundation checkuser From 1.46.0-rc.0 (inc) to 1.46.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

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Executive Summary

This vulnerability is an Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting (XSS). It occurs in the Wikimedia Foundation's CheckUser extension, specifically in certain program files related to temporary accounts. The issue allows malicious input to be improperly handled during the generation of web pages, potentially enabling attackers to inject and execute malicious scripts.

Impact Analysis

The vulnerability could allow attackers to execute malicious scripts in the context of the affected web application. This can lead to unauthorized actions such as stealing user credentials, session hijacking, or performing actions on behalf of legitimate users. However, the CVSS base score is 0.0, indicating that the impact might be limited or requires specific conditions to be exploitable.

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