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CVE PROGRAM SOURCE RECORD4.8 Medium

CVE-2026-9549

Fix XSS in service discovery active check output

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Checkmk GmbH Checkmk

Default version status: unaffected

  • 2.5.0 to < 2.5.0p5affected
  • 2.4.0 to < 2.4.0p31affected
  • 2.3.0 to < 2.3.0p48affected
  • 2.2.0affected

References