Exposure of session signing secret in Checkmk <2.4.0p23, <2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session cookies.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements Present

User Interaction Passive

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Checkmk
  • Checkmk

No data.

No data.

No data.

References
Link Providers
https://checkmk.com/werk/18954 cve-icon cve-icon
History

Tue, 24 Mar 2026 11:45:00 +0000

Type Values Removed Values Added
Description Exposure of session signing secret in Checkmk <2.4.0p23, <2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session cookies.
Title Session hijacking via exposed session signing secret in distributed Checkmk setups
First Time appeared Checkmk
Checkmk checkmk
Weaknesses CWE-522
CPEs cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*
Vendors & Products Checkmk
Checkmk checkmk
References
Metrics cvssV4_0

{'score': 7.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: Checkmk

Published:

Updated: 2026-03-24T11:25:58.183Z

Reserved: 2025-11-12T09:16:24.093Z

Link: CVE-2025-64998

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-24T12:16:11.930

Modified: 2026-03-24T12:16:11.930

Link: CVE-2025-64998

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.