CVE-2025-64998highCWE-522

CVE-2025-64998: high-severity vulnerability in Checkmk

Session hijacking via exposed session signing secret in distributed Checkmk setups

Published · Updated

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.3epss 0.3%
exploitation probability
0.3%top 75% of all CVEs
observed exploitation
nono source reports it
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.
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
Affected products
Checkmk GmbH · Checkmk
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References
https://checkmk.com/werk/18954