CVE-2026-58034

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

State: Published
Severity: 0.0 None
Published: Jul 1, 2026
Updated: Jul 1, 2026
Reserved: Jun 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	0.0 None	CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N	wikimedia-foundation

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Affected Products

Product	Versions
CheckUserWikimedia Foundation	1.46.0-rc.0 to before 1.46.0Affected

References

https://phabricator.wikimedia.org/T428820

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