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CVE-2025-64999— Cross-site scripting in HTML logs of Synthetic Monitoring test services

Quick assessment

Affected
Checkmk GmbH Checkmk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.4.0p22之前版本和2.3.0p43之前版本存在安全漏洞，该漏洞源于输入中和不当，可能导致攻击者通过操纵主机检查输出将恶意JavaScript注入Synthetic Monitoring HTML日志，进而通过特制钓鱼链接访问。

AI Predicted 6.1 Difficulty: Easy EPSS 0.17% · P6
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I. Basic Information for CVE-2025-64999

Vulnerability Information
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Vulnerability Title
Cross-site scripting in HTML logs of Synthetic Monitoring test services
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Checkmk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.4.0p22之前版本和2.3.0p43之前版本存在安全漏洞，该漏洞源于输入中和不当，可能导致攻击者通过操纵主机检查输出将恶意JavaScript注入Synthetic Monitoring HTML日志，进而通过特制钓鱼链接访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Checkmk GmbH Checkmk 2.4.0 ~ 2.4.0p22 -

II. Public POCs for CVE-2025-64999

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III. Intelligence Information for CVE-2025-64999

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Vendor Advisories for CVE-2025-64999 (1)

IV. Related Vulnerabilities

Same product: Checkmk
Same vendor: Checkmk GmbH
Same weakness: CWE-79