Input Manipulation Vulnerability in Checkmk Software
CVE-2025-64999

7.3HIGH

Key Information:

Vendor

Checkmk Gmbh

Status
Checkmk
Vendor
CVE Published:
26 February 2026

What is CVE-2025-64999?

The vulnerability in Checkmk allows attackers to manipulate host check outputs, facilitating the injection of malicious JavaScript into Synthetic Monitoring HTML logs. This can lead to exposure to phishing attacks through crafted links that exploit the injected code. Users of the affected versions should implement security measures to mitigate potential risks associated with this vulnerability.

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Deploy the Patch

Affected Version(s)

Checkmk 2.4.0 < 2.4.0p22

Checkmk 2.3.0 < 2.3.0p43

References

https://checkmk.com/werk/19238
vendor-advisory
https://github.com/sbaresearch/advisories/tree/e72ce9bb6b...
third-party-advisory

CVSS V4

Score:
7.3
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Lisa Gnedt (SBA Research)
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