Checkmk: Mehrere Schwachstellen
WID-SEC-2026-4113 · first 22.10.2026 · updated 22.10.2026 · CVSS 6,3
What it is about
Checkmk ist eine IT-Monitoring-Software. Ein lokaler Angreifer kann mehrere Schwachstellen in Checkmk ausnutzen, um seine Privilegien zu erhöhen oder Monitoring-Daten für Hosts zu übermitteln, die das jeweilige Relay nicht überwachen darf.
Under what conditions?
Only with access to the device or an account on it. Often the second step after a phishing email.
What can happen in the worst case
An attacker could use the vulnerability to
- seine Privilegien zu erhöhen oder Monitoring-Daten für Hosts zu übermitteln
- die das jeweilige Relay nicht überwachen darf
Am I affected?
Affected according to the BSI:
- Checkmk Checkmk <2.4.0p38
- Checkmk Checkmk <2.3.0p51
- Checkmk Checkmk <3.0.0b1
- Checkmk Checkmk <2.5.0p18
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Checkmk Checkmk 2.4.0p38
- Checkmk Checkmk 2.3.0p51
- Checkmk Checkmk 3.0.0b1
- Checkmk Checkmk 2.5.0p18
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- CheckMK Werk 19231 vom 2026-10-21 checkmk.com
- CheckMK Werk 22192 vom 2026-10-21 checkmk.com
CVE: CVE-2026-111573, CVE-2026-15938
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.