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)
Scores
CVSS v3
5.3
EPSS
0.0005
EPSS Percentile
16.2%
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