CVE-2026-33456 | BDVDB-2026-326307 Detail

CheckmkCheckmk

Description#

Livestatus injection in the notification test mode in Checkmk <2.5.0b4 and <2.4.0p26 allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands via a crafted service description.

Impact#

CAPEC-15: Command Delimiters

Weaknesses#

CWE-140 Improper Neutralization of Delimiters

References#

https://checkmk.com/werk/17989

Exploit#

No public exploit known

History#

Version 12026-04-10Record published in the CVE List.
Version 22026-04-14Most recent update recorded in the CVE List.

Published

Published: 2026-04-10
Last modified: 2026-04-14

Vendor information

Vendor: Checkmk
Product: Checkmk

All Checkmk vulnerabilities

Score

5.1 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 9.9.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

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

Affected Systems

Vulnerable
>= 2.5.0 and < 2.5.0b4
Fixed
2.5.0b4
Vulnerable
>= 2.4.0 and < 2.4.0p26
Fixed
2.4.0p26

Scoring System

CVSS v4.0

5.1 Medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	High
User Interaction	None
Vulnerable System Confidentiality	Low
Vulnerable System Integrity	Low
Vulnerable System Availability	Low
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).