CVE-2026-24095 is a vulnerability classified under CWE-862 (Missing Authorization) affecting Checkmk, a widely used IT infrastructure monitoring solution by Checkmk GmbH. The flaw exists in versions 2.4.0 before 2.4.0p21, 2.3.0 before 2.3.0p43, and the end-of-life 2.2.0. The issue arises because users granted the 'Use WATO' permission can bypass intended authorization checks and directly access the 'Analyze configuration' page by navigating to its URL, despite lacking the 'Access analyze configuration' permission. This improper permission enforcement allows these users to view and potentially manipulate configuration analysis features. More critically, if these users also have the 'Make changes, perform actions' permission, they can perform unauthorized actions such as disabling monitoring checks or acknowledging monitoring results, which could undermine the integrity and reliability of the monitoring system. The vulnerability is remotely exploitable without user interaction and requires only low privileges (limited user permissions), making it moderately easy to exploit within an environment where such users exist. The CVSS v4.0 base score is 5.3 (medium severity), reflecting the moderate impact on confidentiality and integrity with no impact on availability. No public exploits or active exploitation have been reported to date. The vulnerability highlights the importance of strict permission management and access control within monitoring platforms to prevent privilege escalation and unauthorized configuration changes.

For European organizations, this vulnerability poses a risk to the integrity and reliability of IT infrastructure monitoring. Unauthorized access to configuration analysis and the ability to disable checks or acknowledge alerts can lead to undetected system failures, delayed incident response, and potential operational disruptions. Critical sectors such as finance, healthcare, energy, and telecommunications that rely heavily on continuous monitoring could experience degraded security posture and operational risks. The ability to manipulate monitoring results may also facilitate further attacks by masking malicious activity. Since Checkmk is used for centralized monitoring, exploitation could affect multiple systems simultaneously, increasing the scope of impact. The medium severity rating indicates that while the vulnerability is not critical, it still requires timely remediation to maintain trust in monitoring data and ensure compliance with regulatory requirements such as GDPR, which mandates robust security controls.

1. Upgrade affected Checkmk instances to the latest patched versions: 2.4.0p21 or 2.3.0p43, or later releases where this authorization issue is resolved. 2. Conduct a thorough audit of user permissions within Checkmk, ensuring that the 'Use WATO' and 'Make changes, perform actions' permissions are granted only to trusted administrators with a clear operational need. 3. Implement the principle of least privilege by segregating duties so that users with 'Use WATO' permission do not simultaneously have change management permissions. 4. Monitor access logs and configuration changes within Checkmk to detect any unauthorized access or suspicious activity related to the 'Analyze configuration' page. 5. If immediate patching is not feasible, restrict network access to the Checkmk web interface to trusted IP ranges and enforce strong authentication mechanisms. 6. Educate administrators and users about the risks of improper permission assignments and encourage regular reviews of access controls. 7. Integrate Checkmk monitoring with centralized SIEM solutions to correlate events and detect potential misuse.