CVE-2026-2859 — Unauthenticated Host Enumeration via Observable Response Discrepancy on Deploy Agent Endpoint
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 obs…
Published: 2026-03-13 · CVSS: 6.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7