AbuseFilter EUVD-2026-41021

| CVE-2026-58027 MEDIUM

Information Exposure (CWE-200)

2026-07-01 wikimedia-foundation

GHSA-xf4f-w4h8-w7rr

PHP Information Disclosure Abusefilter

5.3

CVSS 4.0 · Vendor: wikimedia-foundation

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Vendor (wikimedia-foundation) PRIMARY

5.3 MEDIUM

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

vuln.today AI

4.3 MEDIUM

Network-accessible API requires low-privilege authentication (PR:L); disclosure limited to filter rule metadata (C:L); no integrity or availability impact applies.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (wikimedia-foundation).

CVSS VectorVendor: wikimedia-foundation

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

X

Lifecycle Timeline

2

Patch available

Jul 01, 2026 - 17:01 EUVD

Analysis Generated

Jul 01, 2026 - 16:04 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Sensitive abuse filter configuration data in Wikimedia Foundation's AbuseFilter MediaWiki extension is exposed to authenticated low-privilege users via the QueryAbuseFilters API endpoint (includes/Api/QueryAbuseFilters.php). Authenticated wiki users on affected installations (all versions before 1.46.0, 1.45.4, 1.44.6, and 1.43.9) can retrieve private or restricted filter rule details they should not be authorized to access. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Register low-privilege wiki account

Delivery

Authenticate to MediaWiki API

Exploit

Query QueryAbuseFilters endpoint

Execution

Retrieve private filter rule details

Persist

Analyze filter patterns

Impact

Craft evasion edits bypassing abuse detection

Access

Register low-privilege wiki account

Delivery

Authenticate to MediaWiki API

Exploit

Query QueryAbuseFilters endpoint

Execution

Retrieve private filter rule details

Persist

Analyze filter patterns

Impact

Craft evasion edits bypassing abuse detection

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Vulnerability AssessmentAI

Exploitation	Exploitation requires an authenticated session using a low-privilege registered account on a MediaWiki installation with the AbuseFilter extension installed and enabled, running any version prior to 1.46.0, 1.45.4, 1.44.6, or 1.43.9. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 4.0 base score of 5.3 (Medium) is grounded in a network-accessible (AV:N), low-complexity (AC:L), low-privilege-required (PR:L) attack path with limited confidentiality impact (VC:L) and no integrity or availability impact (VI:N/VA:N), which accurately reflects an information disclosure of filter metadata rather than sensitive user data or system-level compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker registers a standard low-privilege user account on a MediaWiki wiki running an unpatched AbuseFilter version, then authenticates and issues a crafted API request to the QueryAbuseFilters endpoint to enumerate private filter configurations. Armed with the precise regex patterns and conditions used in private abuse filters, the attacker crafts edits or posts that match the exact gaps in coverage, sustaining spam, vandalism, or policy-violating edits that evade automated detection. …
Remediation	Upgrade the AbuseFilter MediaWiki extension to the appropriate patched version for your MediaWiki branch: 1.46.0, 1.45.4, 1.44.6, or 1.43.9. … Detailed patch versions, workarounds, and compensating controls in full report.

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EUVD-2026-41021 vulnerability details – vuln.today

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