CVE-2025-64998

Session hijacking via exposed session signing secret in distributed Checkmk setups

State: Published
Severity: 7.3 High
Published: Mar 24, 2026
Updated: Mar 25, 2026
Reserved: Nov 12, 2025

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.

Scores

CVSS	Score	Vector	Source
4.0	7.3 High	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	Checkmk

Weaknesses

CWE-522 Insufficiently Protected Credentials

Affected Products

Product	Versions
CheckmkCheckmk GmbH	2.4.0 to before 2.4.0p23Affected 2.3.0 to before 2.3.0p45Affected 2.2.0Affected

References

https://checkmk.com/werk/18954vendor-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.