CVE-2026-58027Network attack vector

Authenticated hit-count disclosure via API permission bypass

Published Jul 1, 2026 · Updated Jul 1, 2026

Information disclosure in Wikimedia Foundation AbuseFilter allows remote authenticated users to view private-filter hit counts through the API. QueryAbuseFilters.php returns the requested hits property without applying the private or protected-filter permission check used for restricted data. Any authenticated account that lacks private-filter viewing rights can enumerate per-filter activity counts, but cannot obtain filter rules or abuse-log contents through this flaw.

CVSS severity5.3
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Wikimedia Foundation AbuseFilter allows remote authenticated users to view private-filter hit counts through the API. QueryAbuseFilters.php returns the requested hits property without applying the private or protected-filter permission check used for restricted data. Any authenticated account that lacks private-filter viewing rights can enumerate per-filter activity counts, but cannot obtain filter rules or abuse-log contents through this flaw.

The record

CVE
CVE-2026-58027
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
Wikimedia Foundation
Product
AbuseFilter
Classifications
CWE-200, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <1.46.0, 1.45.4, 1.44.6, 1.43.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wikimedia Foundation · AbuseFilterversion=* <1.46.0, 1.45.4, 1.44.6, 1.43.9

Published CVSS scores

5.3Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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