CVE-2026-58034

MEDIUM

Stored XSS through a system message when blocking a temporary account that's related to other temporary accounts

Title source: cna

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.

References (1)

Core 1

Core References

https://phabricator.wikimedia.org/T428820

Scores

CVSS v3 4.8

EPSS 0.0014

EPSS Percentile 3.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-79

Status published

Products (2)

mediawiki/mediawiki 1.46.0 rc0

Wikimedia Foundation/CheckUser 1.46.0-rc.0 - 1.46.0

Published Jul 01, 2026

Tracked Since Jul 01, 2026