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CVE-2026-120495
Arbitrary file write and code execution via crafted Synthetic Monitoring agent data
Overview
Description

Path traversal in the Synthetic Monitoring "Robotmk" test service of Checkmk <2.5.0p19, <2.4.0p40, and 2.3.0 (EOL) allows an attacker who controls the agent output of a monitored host's check output for a host to inject a crafted robot output to define the contents and location for the generated HTML log, leading to code execution as the site user.

Details
INFO

Published Date :

Nov. 11, 2026, 10:46 a.m.

Last Modified :

Nov. 11, 2026, 10:46 a.m.

Remotely Exploit :

No

Source :

Checkmk
Impact
Affected Products

The following products are affected by CVE-2026-120495 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Checkmk checkmk
: Total Affected Vendor : 1 | Products : 1
Solution
Update Checkmk to a patched version to fix path traversal vulnerability.
  • Update Checkmk to version 2.5.0p19 or later.
  • Update Checkmk to version 2.4.0p40 or later.
  • Update Checkmk to a supported version if using 2.3.0.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-120495 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.