CVE-2026-34090 MEDIUM

CVE-2026-34090: Suggested investigations: Handle suppressed usernames

Vendor Wikimedia Foundation
Product CheckUser
Weakness CWE-200 · Info exposure
Published May 11, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

4.8/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/R:U

What the vulnerability does

01Description

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. This issue affects CheckUser: from 1.45.0 before 1.45.2.

Key dates

02Disclosure timeline

May 11, 2026 CVE published
May 11, 2026 Record updated