Vulnerability DatabaseCVE-2026-2859
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CVE-2026-2859
March 13, 2026
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.
Affected Packages
https://github.com/Checkmk/checkmk.git (GITHUB):
Affected version(s) >=v2.4.0p2 <v2.4.0p22-rc2
Fix Suggestion:
Update to version v2.4.0p22-rc2
https://github.com/Checkmk/checkmk.git (GITHUB):
Affected version(s) >=v2.3.0b1 <v2.3.0p43-rc1
Fix Suggestion:
Update to version v2.3.0p43-rc1
Related Resources (1)
https://checkmk.com/werk/18994
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Observable Response Discrepancy
CWE-204
EPSS
Base Score:
0.04