Description
SSH private keys of the "Remote alert handlers (Linux)" rule were exposed in the rule page's HTML source in Checkmk <= 2.4.0p18 and all versions of Checkmk 2.3.0. This potentially allowed unauthorized triggering of predefined alert handlers on hosts where the handler was deployed.
References (1)
Core 1
Core References
Vendor Advisory
https://checkmk.com/werk/19030
Scores
CVSS v3
5.3
EPSS
0.0018
EPSS Percentile
7.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-212
Status
published
Products (3)
checkmk/checkmk
2.2.0
checkmk/checkmk
2.3.0 (48 CPE variants)
checkmk/checkmk
2.4.0
Published
Dec 18, 2025
Tracked Since
Feb 18, 2026