What is CVE-2025-64998?

CVE-2025-64998 is a high-severity vulnerability in Checkmk, classified under Insufficiently Protected Credentials. CVSS score: 7.2/10. Published 2026-03-24.

How severe is CVE-2025-64998?

High severity. CVSS v3 base score is 7.2 out of 10.

Vulnerability in Checkmk

CVE-2025-64998

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.

EPSS: 0.000 (5.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Checkmk — versions 2.2.0, 2.3.0, 2.4.0
Checkmk Gmbh — versions 2.4.0, 2.3.0, 2.2.0

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

security@checkmk.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-64998?: CVE-2025-64998 is a high-severity vulnerability in Checkmk, classified under Insufficiently Protected Credentials. CVSS score: 7.2/10. Published 2026-03-24.
How severe is CVE-2025-64998?: High severity. CVSS v3 base score is 7.2 out of 10.