CVE-2026-34086

AbuseFilter misuses ::userCanBitfield, exposing access-controlled information

Published May 11, 2026 CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed
Description
Vulnerability in Wikimedia Foundation AbuseFilter.

This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6208-1 mediawiki security update
References
History
Type Values Removed Values Added
Weaknesses CWE-200
CWE-284
Type Values Removed Values Added
Weaknesses CWE-20
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-200
CWE-284
Type Values Removed Values Added
First Time appeared Wikimedia
Wikimedia abusefilter
Vendors & Products Wikimedia
Wikimedia abusefilter
Type Values Removed Values Added
Description Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.
Title AbuseFilter misuses ::userCanBitfield, exposing access-controlled information
References
Metrics cvssV4_0

{'score': 2.1, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
wikimedia-foundation
Published
Updated
May 11, 2026, 5:33 PM
Reserved
Mar 25, 2026, 5:15 PM
Status
Awaiting Analysis
Published
May 11, 2026, 4:17 PM
Modified
Oct 26, 2026, 6:10 PM