CVE-2025-39663
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-30

Last updated on: 2025-12-03

Assigner: Checkmk GmbH

Description
Cross-Site Scripting (XSS) vulnerability in Checkmk's distributed monitoring allows a compromised remote site to inject malicious HTML code into service outputs in the central site. Affecting Checkmk before 2.4.0p14, 2.3.0p39, 2.2.0 and 2.1.0 (eol).
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Meta Information
Published
2025-10-30
Last Modified
2025-12-03
Generated
2026-06-16
AI Q&A
2025-10-30
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39663
Affected Vendors & Products
Showing 53 associated CPEs
Vendor Product Version / Range
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk 2.4.0
checkmk checkmk From 2.0.0 (inc) to 2.3.0 (exc)
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
checkmk checkmk 2.3.0
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CWE-80 The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.
Attack-Flow Graph
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Executive Summary

This vulnerability is a Cross-Site Scripting (XSS) issue in Checkmk's distributed monitoring system. It allows a compromised remote site to inject malicious HTML code into the service outputs displayed on the central monitoring site. This means that an attacker controlling a remote site can cause harmful scripts to run in the context of the central site’s web interface.

Impact Analysis

The impact of this vulnerability includes the potential execution of malicious scripts within the central monitoring site’s interface. This can lead to unauthorized actions, data theft, session hijacking, or other malicious activities performed by the attacker through the injected code. It compromises the integrity and security of the monitoring system.

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