CVE-2025-64998CWE-522

Session hijacking via exposed session signing secret in distributed Checkmk setups

High · published March 24, 2026

CVSS v4.0
7.3
EPSS
0%
Percentile
27.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.3 · HIGH
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
EPSS
0.00348 · 27.1th percentile
Weakness
CWE-522 · Insufficiently Protected Credentials
Published
2026-03-24T11:25Z
EPSS history
Timeline
  • 24 MAR 11:25Z
    Session hijacking via exposed session signing secret in distributed Checkmk setups
    cvelistv5