CVE-2026-2859

MEDIUM

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

Title source: llm

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)

[Various Sources] https://checkmk.com/werk/18994

Scores

CVSS v3 4.3

EPSS 0.0005

EPSS Percentile 14.2%

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