VULNERABILITY INTELLIGENCE

CVE-2026-9549

CVSS score4.8 MEDIUM
EPSS probability0.14%
CISA KEVNot currently listed
Published2026-06-08
Last modified2026-10-23
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Description

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.

Weakness classification

  • security@checkmk.com: CWE-79

Primary references