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Status published
High
CVE-2025-64998
Session hijacking via exposed session signing secret in distributed Checkmk setups
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Lisa Gnedt (SBA Research)
References
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CVE-2025-64999
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CVE-2025-64997
Insufficient permission validation when showing agent information
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6.3
CVE-2025-64996
Overly broad file permissions in the mk_inotify plugin allows reading and manipulating the plugin's output
Medium
4.8
CVE-2025-58122
Insufficient permission validation when configuring notification parameters
Medium
5.3
Affected Vendor
Checkmk GmbH
View all reports →Affected Software
Checkmk
Vulnerable Versions:
2.4.0, 2.3.0, 2.2.0
Timeline
Official Publish:
March 24th, 2026
Last Modified:
March 25th, 2026
Added to House:
July 22nd, 2026