November 14, 2026

CVE Watchtower

CVE-2026-118965Checkmk GmbH Checkmk Path Traversal

NVD

Vulnerability Summary

Path traversal in the discovered host label synchronization in Checkmk <2.5.0p19, <2.4.0p40 and 2.3.0 (EOL) allows an attacker in control of a remote site in a distributed monitoring setup to write arbitrary files on the central site and thereby execute code as the central site user.
Severity Level
CRITICAL(9.4)
Published Date
Nov 11, 2026
Last Modified
Nov 14, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.46%Probability
Root Weakness (CWE)
CWE-22: Path Traversal β†—
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory.
CVSS v4.0 Base Metrics — Score 9.4 (CRITICAL)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredLow
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)High
Integrity (Subsequent System)High
Availability (Subsequent System)High

Affected & Patched Versions

Affected Versions
  • Checkmk GmbH Checkmk >= 2.5.0 and < 2.5.0p19
  • Checkmk GmbH Checkmk >= 2.4.0 and < 2.4.0p40
  • Checkmk GmbH Checkmk 2.3.0
Patched Versions
  • Checkmk GmbH Checkmk 2.5.0p19
  • Checkmk GmbH Checkmk 2.4.0p40

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is critical.

  1. Check whether you run Checkmk GmbH Checkmk and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Nov 11, 2026Published
  • Nov 14, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

Get notified about new Checkmk GmbH Checkmk CVEsYou are reading CVE-2026-118965. Get an email when KEV listings, exploits or new CVEs match your stack.
Set up CVE alerts

External References

Data last checked: Nov 14, 2026 05:11 UTC