CVE-2026-8593 Checkmk GmbH CVE debrief

Who should care

Users of Checkmk versions 2.5.0 before 2.5.0p9, 2.4.0 before 2.4.0p34, 2.3.0 before 2.3.0p49, and 2.2.0 (EOL) should be aware of this vulnerability and take necessary actions to protect their systems. This includes reviewing system logs for suspicious activity and restricting access to BI packs and rules to authorized users.

Technical summary

The vulnerability has a CVSS score of 5.3 and a severity of MEDIUM. The CVE record was published on 2026-07-21T08:16:35.013Z and was last modified on 2026-07-22T20:51:36.300Z. This vulnerability affects Checkmk versions 2.5.0 before 2.5.0p9, 2.4.0 before 2.4.0p34, 2.3.0 before 2.3.0p49, and 2.2.0 (EOL).

Defensive priority

Medium priority

Recommended defensive actions

• Apply patches for Checkmk versions 2.5.0p9, 2.4.0p34, and 2.3.0p49 or later
• Restrict access to BI packs and rules to authorized users
• Monitor system logs for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide information on the vulnerability. However, further investigation is needed to determine the full scope of the vulnerability and affected systems. The source item URL and CVE record provide additional context.

Official resources