VulnSocial

CVE-2026-2859Disclosure(checkmk / checkmk)

LOWCVSS 4.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

checkmk CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-204

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • checkmk

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
checkmk
Products
checkmk

3 versions affected across 1 product

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-03-13: 1Technical Details · 2026-03-13: 103-13
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • CVE@CVEnew
    Disclosure

    CVE-2026-2859 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 hos… https://www.cve.org/CVERecord?id=CVE-2026-2859

    Post summary

    A concise disclosure of CVE‑2026‑2859 notes that Checkmk versions 2.4.0 through 2.2.0 suffer from improper permission enforcement, allowing unauthenticated host enumeration, with no PoC, exploit, or patch mentioned.

    0000089
    56.7K followersView on X
CPE platform detail135 entries

135 of 135 entries

PartVendorProductVersionTarget SWTarget HW
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.2.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.3.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--
Appcheckmkcheckmk2.4.0--

Explore more

Back to dashboardcheckmk CVEscheckmk vulnerabilities