CVE-2025-64999

5.4 MEDIUM

Published: February 26, 2026 Modified: March 05, 2026

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://checkmk.com/werk/19238

Source: security@checkmk.com

Vendor Advisory

https://github.com/sbaresearch/advisories/tree/e72ce9bb6b9ffffc1fc35e4d8152ad153293c851/2025/SBA-ADV-20251118-01_Checkmk_Cross_Site_Scripting

Source: security@checkmk.com

2 reference(s) from NVD

Quick Stats

CVSS v3 Score

5.4 / 10.0

EPSS (Exploit Probability)

0.0%

8th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-79

Affected Vendors

checkmk

Related CVEs

CVE-2019-25572 6.2

CVE-2019-25571 6.2

CVE-2019-25570 5.5

CVE-2019-25569 6.2

CVE-2019-25568 9.8