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CVE-2026-8593 Checkmk GmbH CVE debrief

CVE-2026-8593 is an improper permission enforcement vulnerability affecting 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). This vulnerability allows users without permissions to view and modify BI packs and rules. The vulnerability has a CVSS score of 5.3 and a severity of MEDIUM. 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.

Vendor
Checkmk GmbH
Product
Checkmk
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-21
Original CVE updated
2026-07-22
Advisory published
2026-07-21
Advisory updated
2026-07-22

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8593 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8593

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-8593 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8593

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.