CVE-2025-64999 — MEDIUM (5.4)

Vulnerability Description

Improper neutralization of input in Checkmk versions 2.4.0 before 2.4.0p22, and 2.3.0 before 2.3.0p43 allows an attacker that can manipulate a host's check output to inject malicious JavaScript into the Synthetic Monitoring HTML logs, which can then be accessed via a crafted phishing link.

CVSS Score

5.4

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Checkmk	Checkmk	2.3.0

Related Weaknesses (CWE)

CWE-79

References

FAQ

What is CVE-2025-64999?

CVE-2025-64999 is a vulnerability with a CVSS score of 5.4 (MEDIUM). Improper neutralization of input in Checkmk versions 2.4.0 before 2.4.0p22, and 2.3.0 before 2.3.0p43 allows an attacker that can manipulate a host's check output to inject malicious JavaScript into t...

How severe is CVE-2025-64999?

CVE-2025-64999 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-64999?

Check the references section above for vendor advisories and patch information. Affected products include: Checkmk Checkmk.