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CVE-2026-7186 Checkmk GmbH CVE debrief

CVE-2026-7186 is a HIGH severity vulnerability in Checkmk versions <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions. It allows users with dashboard editing permissions to store a URL with a dangerous URI scheme, such as javascript:, that executes scripts in other users' browsers when they view the dashboard.

Vendor
Checkmk GmbH
Product
Checkmk
CVSS
HIGH 8.5
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 <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions who have dashboard editing permissions.

Technical summary

The vulnerability is a stored cross-site scripting (XSS) issue in the URL dashboard widget of Checkmk. An attacker with dashboard editing permissions can store a URL with a malicious URI scheme, such as javascript:, which will execute scripts in the browsers of other users who view the dashboard.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Checkmk version 2.5.0p5 or later, 2.4.0p31 or later, or 2.3.0p48 or later.
  • Restrict dashboard editing permissions to trusted users.
  • Monitor dashboard usage for suspicious activity.

Evidence notes

CVE-2026-7186 was published on 2026-06-08T13:16:33.480Z and modified on 2026-06-08T15:53:35.183Z. The CVSS score is 8.5 (HIGH).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-7186 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-7186

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

  • CVE-2026-7186 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-7186

    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.