CVE-2025-64998 HIGH

CVE-2025-64998: Session hijacking via exposed session signing secret in distributed Checkmk setups

Vendor Checkmk Gmbh
Product Checkmk
Weakness CWE-522 · Insufficiently protected credentials
Published March 24, 2026
Last update March 25, 2026
View on NVD All CVEs

CVSS base score

7.3/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction —
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 24, 2026 CVE published
March 25, 2026 Record updated