CVE-2026-58034: Mediawiki

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Mediawiki Mediawiki: version 1.46.0 only

Published 2026-07-01. Last modified 2026-07-09.