CVE-2026-34086— AbuseFilter misuses ::userCanBitfield, exposing access-controlled information
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Wikimedia Foundation | AbuseFilter | *< 1.43.7, 1.44.4, 1.45.2 | affected |
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I. Basic Information for CVE-2026-34086
Vulnerability Information
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Vulnerability Title
AbuseFilter misuses ::userCanBitfield, exposing access-controlled information
Source: NVD (National Vulnerability Database)
Vulnerability Description
Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Wikimedia AbuseFilter 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wikimedia AbuseFilter是Wikimedia基金会的一个编辑过滤工具，用于根据自定义规则自动过滤和阻止可疑的编辑、账号创建等破坏行为。 Wikimedia AbuseFilter 1.43.7之前版本、1.44.4版本和1.45.2版本存在输入验证错误漏洞，该漏洞源于userCanBitfield暴露访问控制信息。
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 | AbuseFilter | * ~ 1.43.7, 1.44.4, 1.45.2 | - |
II. Public POCs for CVE-2026-34086
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Wikimedia Foundation · 2026-05-11 · 11 CVEs total
| CVE-2026-34090 | Suggested investigations: Handle suppressed usernames | |
| 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-2026-34087 | 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 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
V. Comments for CVE-2026-34086
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