CVE-2025-64998

HIGH

Session hijacking via exposed session signing secret in distributed Checkmk setups

Title source: cna

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.

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory

https://checkmk.com/werk/18954

Scores

CVSS v3 7.2

EPSS 0.0033

EPSS Percentile 25.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-522

Status published

Products (1)

checkmk/checkmk 2.2.0 (50 CPE variants)

Published Mar 24, 2026

Tracked Since Mar 24, 2026