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Vulnerability IntelligenceCVE-2026-2859

CVE-2026-2859

MEDIUM6.3

Unauthenticated Host Enumeration via Observable Response Discrepancy on Deploy Agent Endpoint

Published Mar 13, 2026

Modified 1 months ago

Details

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

https://checkmk.com/werk/18994

https://www.cve.org/CVERecord?id=CVE-2026-2859

CVSS Analysis

CVSS v4.0

6.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Attack Requirements

PresentAT:P

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Vulnerable System

Vuln. Confidentiality

LowVC:L

Vuln. Integrity

NoneVI:N

Vuln. Availability

NoneVA:N

Subsequent System

Subseq. Confidentiality

NoneSC:N

Subseq. Integrity

NoneSI:N

Subseq. Availability

NoneSA:N

6.3/CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Weakness Type (CWE)

Other

Ecosystems

Timeline

PublishedMar 13, 2026

ModifiedMar 13, 2026

CVE-2026-2859 | Mondoo Vulnerability Intelligence