CVE-2025-39663

Cross Site Scripting through compromised remote site

State: Published
Severity: 8.5 High
Published: Oct 30, 2025
Updated: Nov 7, 2025
Reserved: Apr 16, 2025

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).

Scores

CVSS	Score	Vector	Source
4.0	8.5 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	Checkmk

Weaknesses

CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Affected Products

Product	Versions
CheckmkCheckmk GmbH	2.4.0 to before 2.4.0p14Affected 2.3.0 to before 2.3.0p39Affected 2.2.0Affected 2.1.0Affected

References

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