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

Quick assessment

Affected
Wikimedia Foundation CheckUser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wikimedia CheckUser是Wikimedia基金会的一个打击破坏行为的高级调查工具。 Wikimedia CheckUser 1.45.0版本至1.45.2之前版本存在信息泄露漏洞，该漏洞源于敏感信息泄露给未授权攻击者。

AI Predicted 5.3 Difficulty: Easy EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
Wikimedia Foundation CheckUser 1.45.0< 1.45.2 affected
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I. Basic Information for CVE-2026-34090

Vulnerability Information
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Vulnerability Title
Suggested investigations: Handle suppressed usernames
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Wikimedia CheckUser 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wikimedia CheckUser是Wikimedia基金会的一个打击破坏行为的高级调查工具。 Wikimedia CheckUser 1.45.0版本至1.45.2之前版本存在信息泄露漏洞，该漏洞源于敏感信息泄露给未授权攻击者。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wikimedia Foundation CheckUser 1.45.0 ~ 1.45.2 -

II. Public POCs for CVE-2026-34090

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-34090

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Patches & Fixes for CVE-2026-34090 (1)

Same Patch Batch · Wikimedia Foundation · 2026-05-11 · 11 CVEs total

CVE-2026-34089 Memory leak in Scribunto causes runJobs.php to run out of memory
CVE-2026-34092 Block UI elements in 'tools'-sidebar shows presence of an autoblocked IP
CVE-2026-34091 User localization leaked by AbuseFilter + EventStream
CVE-2026-34086 AbuseFilter misuses ::userCanBitfield, exposing access-controlled information
CVE-2026-34087 Users API leaks whether privileged users have their user groups disabled for lack of 2FA
CVE-2026-34093 Special:UserRights allows viewing user rights from private wiki
CVE-2026-34094 Customized help link for page protection indicator is relative to subpage name, because th
CVE-2026-34095 action=raw with Special:Mypage subpage title responds with "Content-Type: text/html" on ct
CVE-2026-34088 RecentChanges entries expose suppressed content via generated log page html
CVE-2026-5266 Wikimedia Echo 信息泄露漏洞

IV. Related Vulnerabilities

Same product: CheckUser
Same vendor: Wikimedia Foundation
Same weakness: CWE-200

V. Comments for CVE-2026-34090

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