CVE-2025-64998 | BDVDB-2026-322150 Detail

CheckmkCheckmk

Description#

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.

Impact#

CAPEC-196: Session Credential Falsification through Forging

Weaknesses#

CWE-522 Insufficiently Protected Credentials

References#

https://checkmk.com/werk/18954

Exploit#

No public exploit known

History#

Version 12026-03-24Record published in the CVE List.
Version 22026-03-25Most recent update recorded in the CVE List.

Published

Published: 2026-03-24
Last modified: 2026-03-25

Vendor information

Vendor: Checkmk
Product: Checkmk

All Checkmk vulnerabilities

Score

7.3 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 29.5.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Credential Exposure

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 2.4.0 and < 2.4.0p23
Fixed
2.4.0p23
Vulnerable
>= 2.3.0 and < 2.3.0p45
Fixed
2.3.0p45
Vulnerable
2.2.0
Fixed
Not stated

Scoring System

CVSS v4.0

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	High
User Interaction	Passive
Vulnerable System Confidentiality	High
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).