CVE-2026-24096Network attack vector

Unauthorized Quick Setup actions via missing permission checks

Published Apr 1, 2026 · Updated Apr 1, 2026

Authorization flaws in Checkmk before 2.4.0p25 and 2.5.0b2 allow remote authenticated users to alter Quick Setups and read job status. Quick Setup REST endpoints accepted crafted PUT and POST requests without granular checks for access to a specific setup or the permission level required for its actions. Any authenticated account in the default configuration could modify stage data, run setup actions, and read background-job state containing sensitive information.

CVSS severity5.3
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization flaws in Checkmk before 2.4.0p25 and 2.5.0b2 allow remote authenticated users to alter Quick Setups and read job status. Quick Setup REST endpoints accepted crafted PUT and POST requests without granular checks for access to a specific setup or the permission level required for its actions. Any authenticated account in the default configuration could modify stage data, run setup actions, and read background-job state containing sensitive information.

The record

CVE
CVE-2026-24096
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-280, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=2.4.0 <2.4.0p25
  2. Affected versionversion=2.5.0b1 <2.5.0b2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=2.4.0 <2.4.0p25; version=2.5.0b1 <2.5.0b2

Published CVSS scores

5.3Checkmk GmbHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA: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-280Improper Handling of Insufficient Permissions or Privileges
T1565.001Stored Data Manipulation

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

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Your stack

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