CVE-2025-39663

HIGH EPSS 41.8%
Published Oct 30, 20258mo ago · Modified Jun 17, 20261w ago
8.5 CVSS 4.0
High
Find Similar
Published Oct 30, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

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).

CVSS Details

Base Score
8.5
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
41.8% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 2

CWE-79 Cross-site Scripting Injection
CWE-80

Affected Products 53

VendorProductVersionRange
checkmkcheckmk*≥2.0.0  –  <2.3.0
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any

References 3

  • seclists.org http://seclists.org/fulldisclosure/2025/Nov/0
    ExploitMailing ListThird Party Advisory
  • checkmk.com https://checkmk.com/werk/17998
    Vendor Advisory
  • github.com https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting
    ExploitThird Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.