VULNERABILITY INTELLIGENCE

CVE-2025-39663

CVSS score8.4 HIGH

EPSS probability0.60%

CISA KEVNot currently listed

Published2025-10-30

Last modified2026-10-19

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

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).

Weakness classification

security@checkmk.com: CWE-80
nvd@nist.gov: CWE-79

Primary references

security@checkmk.com — Vendor Advisory
security@checkmk.com — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Mailing List, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Third Party Advisory