CVE-2026-2859

MEDIUM

Checkmk 2.4.0-2.4.0p22/2.3.0-2.3.0p42 - Info Disclosure

Title source: llm
STIX 2.1

Description

Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows unauthenticated users to enumerate existing hosts by observing different HTTP response codes in deploy_agent endpoint, which could lead to information disclosure.

References (1)

Core 1
Core References

Scores

CVSS v3 4.3
EPSS 0.0019
EPSS Percentile 8.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-204
Status published
Products (1)
checkmk/checkmk 2.2.0 (50 CPE variants)
Published Mar 13, 2026
Tracked Since Mar 14, 2026