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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (24.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
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)
References
- checkmk.com/werk/18954 (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.