Executive brief
Checkmk is an IT infrastructure monitoring solution used to track the health of servers and networks. A security flaw in its notification testing feature allows authorized users to bypass intended restrictions and execute unauthorized commands within the monitoring database. This could allow a user to view sensitive monitoring data or disrupt the availability of the monitoring service.
Technical details
A Livestatus injection vulnerability exists in Checkmk's notification test mode due to improper neutralization of delimiters (CWE-140). The application fails to properly sanitize user-supplied service description values before interpolating them into Livestatus queries. An authenticated attacker with access to the notification test page can provide a crafted service description to inject and execute arbitrary Livestatus commands. This can lead to unauthorized data retrieval or service disruption. The issue is resolved in versions 2.5.0b4 and 2.4.0p26.
Affected products
- Checkmk Checkmk < 2.5.0b4, < 2.4.0p26
Timeline
- 2026-03-23: patched: Vendor released fix in versions 2.5.0b4 and 2.4.0p26
- 2026-04-10: disclosed: Initial CVE publication