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CVE-2026-34086— AbuseFilter misuses ::userCanBitfield, exposing access-controlled information

Quick assessment

Affected
Wikimedia Foundation AbuseFilter
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 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。

AI Predicted 9.8 Difficulty: Easy EPSS 0.32% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
Vulnerability Description
Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/S:N/AU:Y
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-34086

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Other References for CVE-2026-34086 (1)

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 product: AbuseFilter
Same vendor: Wikimedia Foundation

V. Comments for CVE-2026-34086

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