CVE-2026-33456: Checkmk

High severity, CVSS 7.6. EPSS: 0.3% chance of exploitation in the next 30 days.

Livestatus injection in the notification test mode in Checkmk <2.5.0b4 and <2.4.0p26 allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands via a crafted service description.

Affected products

• Checkmk Checkmk: version 2.4.0 only; version 2.5.0 only

Published 2026-04-10. Last modified 2026-06-17.