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Vulnerability Details :

CVE-2026-34086

Summary
Assigner-wikimedia-foundation
Assigner Org ID-c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
Published At-11 May, 2026 | 14:35
Updated At-11 May, 2026 | 17:33
Rejected At-
Credits

AbuseFilter misuses ::userCanBitfield, exposing access-controlled information

Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:wikimedia-foundation
Assigner Org ID:c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
Published At:11 May, 2026 | 14:35
Updated At:11 May, 2026 | 17:33
Rejected At:
▼CVE Numbering Authority (CNA)
AbuseFilter misuses ::userCanBitfield, exposing access-controlled information

Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Affected Products
Vendor
Wikimedia FoundationWikimedia Foundation
Product
AbuseFilter
Repo
https://gerrit.wikimedia.org/g/mediawiki/extensions/AbuseFilter/+/refs/heads/master
Default Status
unaffected
Versions
Affected
  • From * before 1.43.7, 1.44.4, 1.45.2 (semver)
Metrics
VersionBase scoreBase severityVector
4.02.1LOW
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
Version: 4.0
Base score: 2.1
Base severity: LOW
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://phabricator.wikimedia.org/T415584
N/A
Hyperlink: https://phabricator.wikimedia.org/T415584
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-20CWE-20 Improper Input Validation
Type: CWE
CWE ID: CWE-20
Description: CWE-20 Improper Input Validation
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
Published At:11 May, 2026 | 16:17
Updated At:12 May, 2026 | 14:45

Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.02.1LOW
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/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:N/AU:Y/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 2.1
Base severity: LOW
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/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:N/AU:Y/R:X/V:X/RE:X/U:X
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-20Secondary134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE ID: CWE-20
Type: Secondary
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://phabricator.wikimedia.org/T415584c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
N/A
Hyperlink: https://phabricator.wikimedia.org/T415584
Source: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
Resource: N/A

Change History

0
Information is not available yet

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Details not found