Medium severity · published Jul 1, 2026
CVE-2026-58027
QueryAbuseFilter API can be used to see the hit count of private filters, which is hidden in the UI
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AB
AbuseFilter · Wikimedia Foundation
before 1.46.0, 1.45.4, 1.44.6, 1.43.9 · source: vendor
ME
Mediawiki · Mediawiki
1.43.0 before 1.43.9; 1.44.0 before 1.44.6; 1.45.0 before 1.45.4; 1.46.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-58027
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-58027
Permissions Required
https://phabricator.wikimedia.org/T406954
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AbuseFilter misuses ::userCanBitfield, exposing access-controlled information
2.1
CVE-2025-6592
Creating a permanent account from a temporary account associates temp username and IP address with real username in AbuseLog