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VULNERABILITIES

CVE-2026-2859 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://checkmk.com/werk/18994 [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-204Observable Response Discrepancy[email protected]

Affected Products

ProductVersions
checkmk checkmk
2.2.0 -
2.2.0 b1
2.2.0 b2
2.2.0 b3
2.2.0 b4

CPE

  • cpe:2.3:a:checkmk:checkmk:2.2.0:-:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b2:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b3:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b4:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b5:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b6:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b7:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:b8:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:i1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p10:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p11:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p12:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p13:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p14:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p15:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p16:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p17:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p18:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p19:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p2:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p20:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p21:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p22:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p23:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p24:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p25:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p26:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p27:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p28:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p29:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p3:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p30:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p31:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p32:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p33:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p34:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p35:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p36:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p37:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p38:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p39:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p4:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p40:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p41:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p42:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p43:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p44:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p45:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p46:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p47:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p5:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p6:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p7:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p8:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.2.0:p9:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:-:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:b1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:b2:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:b3:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:b4:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:b5:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:b6:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p10:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p11:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p12:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p13:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p14:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p15:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p16:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p17:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p18:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p19:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p2:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p20:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p21:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p22:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p23:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p24:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p25:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p26:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p27:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p28:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p29:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p3:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p30:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p31:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p32:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p33:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p34:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p35:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p36:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p37:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p38:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p39:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p4:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p40:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p41:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p42:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p5:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p6:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p7:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p8:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.3.0:p9:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:-:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:b1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:b2:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:b3:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:b4:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:b5:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:b6:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p1:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p10:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p11:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p12:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p13:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p14:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p15:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p16:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p17:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p18:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p19:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p2:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p20:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p21:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p22:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p3:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p4:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p5:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p6:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p7:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p8:*:*:*:*:*:*
  • cpe:2.3:a:checkmk:checkmk:2.4.0:p9:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes


QUICK INFO

CVE Dictionary Entry:
CVE-2026-2859
NVD Published Date:
Mar 13, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-2859 Details - Not Deferred