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PatchSiren cyber security CVE debrief

CVE-2026-7765 Checkmk GmbH CVE debrief

CVE-2026-7765 is a medium-severity vulnerability in Checkmk versions prior to 2.5.0p5. The issue lies in the User Messages dashboard widget, where incorrect authorization allows an attacker with a valid public dashboard share token to read the dashboard creator's personal messages by sending requests to the underlying endpoint, even without a User Messages widget present.

Vendor
Checkmk GmbH
Product
Checkmk
CVSS
MEDIUM 6.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-07-23
Advisory published
2026-06-08
Advisory updated
2026-07-23

Who should care

Users of Checkmk versions prior to 2.5.0p5 should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability has a CVSS score of 6.3 and is classified as CWE-863. It allows an attacker to access the dashboard creator's personal messages by exploiting the message-fetching endpoints.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to Checkmk version 2.5.0p5 or later.
  • Review and restrict access to dashboard share tokens.
  • Monitor for suspicious activity on the User Messages dashboard widget.

Evidence notes

Evidence for this CVE comes from the NVD and Checkmk's official advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-7765 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-7765

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

  • CVE-2026-7765 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-7765

    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.