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CVE-2026-58027— QueryAbuseFilter API can be used to see the hit count of private filters, which is hidden in the UI

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 Foundation AbuseFilter是Wikimedia Foundation的防滥用过滤器。 Wikimedia Foundation AbuseFilter存在信息泄露漏洞，该漏洞源于程序文件includes/Api/QueryAbuseFilters.php导致敏感信息泄露给未经授权的行为者。以下版本受到影响：1.46.0之前版本、1.45.4版本、1.44.6版本和1.43.9版本。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
Wikimedia Foundation AbuseFilter *< 1.46.0, 1.45.4, 1.44.6, 1.43.9 affected
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I. Basic Information for CVE-2026-58027

Vulnerability Information
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Vulnerability Title
QueryAbuseFilter API can be used to see the hit count of private filters, which is hidden in the UI
Source: CVE Program / CVE List V5
Vulnerability Description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation AbuseFilter. This vulnerability is associated with program files includes/Api/QueryAbuseFilters.Php. This issue affects AbuseFilter: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Wikimedia Foundation AbuseFilter 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wikimedia Foundation AbuseFilter是Wikimedia Foundation的防滥用过滤器。 Wikimedia Foundation AbuseFilter存在信息泄露漏洞，该漏洞源于程序文件includes/Api/QueryAbuseFilters.php导致敏感信息泄露给未经授权的行为者。以下版本受到影响：1.46.0之前版本、1.45.4版本、1.44.6版本和1.43.9版本。
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 * ~ 1.46.0, 1.45.4, 1.44.6, 1.43.9 -

II. Public POCs for CVE-2026-58027

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III. Intelligence Information for CVE-2026-58027

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Other References for CVE-2026-58027 (1)

Same Patch Batch · Wikimedia Foundation · 2026-07-01 · 18 CVEs total

CVE-2026-58033 "Total number of distinct authors" statistic at action=info does not exclude revisions whe
CVE-2026-8857 Full RCE using EasyTimeline Extension
CVE-2026-13706 UrlShortener extension url validation can be bypassed due to difference between php url pa
CVE-2026-13707 Session fixation attacks on improperly configured OAuth 1.0a tools
CVE-2026-58034 Stored XSS through a system message when blocking a temporary account that's related to ot
CVE-2026-58028 Pretty-printed API output combined with centralauthtoken allows XSS with certain gadgets
CVE-2026-58029 Full Account Takeover from BotPasswords and OAuth via action=changeauthenticationdata
CVE-2026-58036 Users API leaks whether privileged users have their user groups disabled for lack of 2FA
CVE-2026-58030 SyntaxHighlight stored XSS via unsanitized 'linelinks' attribute
CVE-2026-58037 Core log entries for exceptions and XSS issues in log entry formatting code that may be ca
CVE-2026-58038 Stored XSS through javascript URLs in SVGs generated by EasyTimeline
CVE-2026-58031 Stored i18n XSS in Special:ApiSandbox when a deprecated module is selected
CVE-2026-58032 mw.Api.getErrorMessage() may return injected HTML if used without errorformat=html
CVE-2026-58024 API identification of users on private wikis
CVE-2026-58025 Remote Code Execution via Unsafe Deserialization in LogItem Import
CVE-2026-58026 $wgNonincludableNamespaces can be bypassed by embedding redirect in other namespaces
CVE-2026-58035 Stored XSS through a system message in the codex version of Special:Block

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-58027

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