CVE-2026-2859 | BDVDB-2026-320305 Detail

CheckmkCheckmk

Description#

Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows unauthenticated users to enumerate existing hosts by observing different HTTP response codes in deploy_agent endpoint, which could lead to information disclosure.

Impact#

CAPEC-180: Exploiting Incorrectly Configured Access Control Security Levels

Weaknesses#

CWE-204 Observable Response Discrepancy

References#

https://checkmk.com/werk/18994

Exploit#

No public exploit known

History#

Version 12026-03-13Record published in the CVE List.

Published

Published: 2026-03-13
Last modified: 2026-03-13

Vendor information

Vendor: Checkmk
Product: Checkmk

All Checkmk vulnerabilities

Score

6.3 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 12.8.

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
>= 2.4.0 and < 2.4.0p23
Fixed
2.4.0p23
Vulnerable
>= 2.3.0 and < 2.3.0p43
Fixed
2.3.0p43
Vulnerable
2.2.0
Fixed
Not stated

Scoring System

CVSS v4.0

6.3 Medium

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

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