Vulnerability Details CVE-2026-9549
Stored cross-site scripting in the service discovery active check output in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can configure active or custom checks to inject malicious HTML or JavaScript into check output that executes in the browser of an admin or a user with host read permissions when they run the check on the service discovery page.
Exploit prediction scoring system (EPSS) score
CVSS Severity
CVSS v3 Score 4.8
References
Products affected by CVE-2026-9549
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cpe:2.3:a:checkmk:checkmk:2.2.0
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cpe:2.3:a:checkmk:checkmk:2.3.0
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cpe:2.3:a:checkmk:checkmk:2.4.0
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cpe:2.3:a:checkmk:checkmk:2.5.0