EUVD-2026-11784

| CVE-2026-2859 MEDIUM
2026-03-13 Checkmk
4.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 13, 2026 - 10:00 vuln.today
EUVD ID Assigned
Mar 13, 2026 - 10:00 euvd
EUVD-2026-11784
CVE Published
Mar 13, 2026 - 09:40 nvd
MEDIUM 4.3

Tags

Information Disclosure Checkmk

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.

Analysis

Checkmk contains an improper permission enforcement vulnerability in the deploy_agent endpoint that allows unauthenticated users to enumerate existing hosts by analyzing differential HTTP response codes, resulting in information disclosure. The vulnerability affects Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and end-of-life version 2.2.0, with a CVSS score of 6.3 indicating moderate severity. …

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Remediation

Within 30 days: Identify affected systems running Checkmk and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +22
POC: 0

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EUVD-2026-11784 vulnerability details – vuln.today
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