CVE-2026-34090— Suggested investigations: Handle suppressed usernames
Possible ATT&CK Techniques 1AI
T1005 · Data from Local SystemAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
信息暴露
Source: NVD (National Vulnerability Database)
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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No public POC found.
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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
- CVE-2025-67478
Wrong E-Mail address composition for usernames with a comma - CVE-2025-61658
Special:GlobalContributions shows edits on wikis the viewer - CVE-2025-61651
i18n XSS through Special:CheckUser CheckUser helper - CVE-2025-61648
Stored XSS through system messages in CheckUser - CVE-2025-61649
UserInfoCard: Check that performing user has permission to v
Same vendor: Wikimedia Foundation
- CVE-2026-5266
Wikimedia Echo 信息泄露漏洞 - CVE-2026-34095
action=raw with Special:Mypage subpage title responds with " - CVE-2026-34094
Customized help link for page protection indicator is relati - CVE-2026-34093
Special:UserRights allows viewing user rights from private w - CVE-2026-34092
Block UI elements in 'tools'-sidebar shows presence of an au
Same weakness: CWE-200
- CVE-2026-8750
h2oai h2o-3 ImportFile API PersistNFS.java importFiles infor - CVE-2026-45351
Open WebUI: Exposure of System Prompt to Regular User [Non-A - CVE-2026-45387
Open WebUI: Sharing models for others to use (read permissio - CVE-2026-41960
Calls权限控制漏洞影响可用性 - CVE-2026-41615
Microsoft Authenticator Information Disclosure Vulnerability
V. Comments for CVE-2026-34090
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