CVE-2025-39663

8.4 HIGH

Published: October 30, 2025 Modified: December 03, 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).

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://checkmk.com/werk/17998

Source: security@checkmk.com

Vendor Advisory

https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting

Source: security@checkmk.com

Exploit Third Party Advisory

http://seclists.org/fulldisclosure/2025/Nov/0

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Mailing List Third Party Advisory

https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Exploit Third Party Advisory

4 reference(s) from NVD

Quick Stats

CVSS v3 Score

8.4 / 10.0

EPSS (Exploit Probability)

0.1%

18th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-80 CWE-79

Affected Vendors

checkmk

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