CVE-2025-64998

7.3 highEPSS 0.3%

High (7.3) in checkmk checkmk. EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 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

CVSS 3.1

7.2 high

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 28% of CVEs (scores of 2026-11-01)
CWE: CWE-522
Published: 2026-03-24
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

checkmk:checkmk

References

https://checkmk.com/werk/18954

Check your stack JSON