CVE-2025-53499Network attack vector

Protected-variable disclosure via unchecked match API

Published Jul 7, 2025 · Updated Jul 8, 2025

Missing authorization in Wikimedia Foundation MediaWiki AbuseFilter 1.43.x before 1.43.2 allows remote attackers to infer protected data. The abusefiltercheckmatch API evaluates attacker-supplied expressions against AbuseFilter variables without enforcing the protected-variable access right, returning match results as an oracle. Any API caller who can identify a log entry can use comparison operators to narrow protected values, including an editor's IP address, without permission to view them.

CVSS severity9.1
Critical
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authorization in Wikimedia Foundation MediaWiki AbuseFilter 1.43.x before 1.43.2 allows remote attackers to infer protected data. The abusefiltercheckmatch API evaluates attacker-supplied expressions against AbuseFilter variables without enforcing the protected-variable access right, returning match results as an oracle. Any API caller who can identify a log entry can use comparison operators to narrow protected values, including an editor's IP address, without permission to view them.

The record

CVE
CVE-2025-53499
Published
Jul 7, 2025
Updated
Jul 8, 2025
Vendor
Wikimedia Foundation
Product
MediaWiki AbuseFilter
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.43.x <1.43.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · MediaWiki AbuseFilterversion=1.43.x <1.43.2

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo