Vulnerability DatabaseCVE-2025-39663
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CVE-2025-39663
October 30, 2025
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).
Affected Packages
https://github.com/Checkmk/checkmk.git (GITHUB):
Affected version(s) >=v2.3.0p1 <v2.3.0p39
Fix Suggestion:
Update to version v2.3.0p39
https://github.com/Checkmk/checkmk.git (GITHUB):
Affected version(s) >=v2.4.0p1 <v2.4.0p14
Fix Suggestion:
Update to version v2.4.0p14
Related Resources (3)
https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting
https://checkmk.com/werk/17998
http://seclists.org/fulldisclosure/2025/Nov/0
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CVSS v4
Base Score:
8.5
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-80
EPSS
Base Score:
0.06