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Unrated severityNVD Advisory· Published Mar 13, 2026· Updated Mar 13, 2026

Unauthenticated Host Enumeration via Observable Response Discrepancy on Deploy Agent Endpoint

CVE-2026-2859

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

2
  • Checkmk/Checkmkllm-fuzzy2 versions
    >=2.2.0, <=2.2.0 (EOL); >=2.3.0, <2.3.0p43; >=2.4.0, <2.4.0p23+ 1 more
    • (no CPE)range: >=2.2.0, <=2.2.0 (EOL); >=2.3.0, <2.3.0p43; >=2.4.0, <2.4.0p23
    • (no CPE)range: 2.4.0

Patches

Vulnerability mechanics

References

1

News mentions

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