CVE-2026-58034 PUBLISHED

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

Assigner: wikimedia-foundation
Reserved: 27.06.2026 Published: 01.07.2026 Updated: 01.07.2026

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 Vector: 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
CVSS Score: 0

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	High
User Interaction	Active

CVSS 4.0

Vendor	Wikimedia Foundation
Product	CheckUser
Versions	Default: unaffected affected from 1.46.0-rc.0 to 1.46.0 (excl.)

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