CVE-2026-2859— Unauthenticated Host Enumeration via Observable Response Discrepancy on Deploy Agent Endpoint
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I. Basic Information for CVE-2026-2859
Vulnerability Information
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Vulnerability Title
Unauthenticated Host Enumeration via Observable Response Discrepancy on Deploy Agent Endpoint
Source: NVD (National Vulnerability Database)
Vulnerability Description
Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows unauthenticated users to enumerate existing hosts by observing different HTTP response codes in deploy_agent endpoint, which could lead to information disclosure.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
响应差异性信息暴露
Source: NVD (National Vulnerability Database)
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 2.4.0p23之前版本、2.3.0p43之前版本和2.2.0版本存在安全漏洞，该漏洞源于权限执行不当，可能导致未经身份验证的用户通过观察deploy_agent端点不同的HTTP响应码来枚举现有主机，从而造成信息泄露。
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 ~ 2.4.0p23 | - |
II. Public POCs for CVE-2026-2859
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Livestatus injection in monitoring quicksearch - CVE-2025-39666
omd: Local privilege escalation when executing omd commands - CVE-2026-3466
Cross-site scripting in dashlet title
Same vendor: Checkmk GmbH
- CVE-2026-33457
Potential livestatus injection in prediction graph page - CVE-2026-33456
Potential livestatus injection in notification test - CVE-2026-33455
Livestatus injection in monitoring quicksearch - CVE-2025-39666
omd: Local privilege escalation when executing omd commands - CVE-2026-3466
Cross-site scripting in dashlet title
Same weakness: CWE-204
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Industrial Application Software IAS Canias ERP Login RMI doA - CVE-2026-20195
Cisco Identity Services Engine Observable Response Discrepan - CVE-2026-24468
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Information Disclosure vulnerability in SAP Human Capital Ma - CVE-2026-4113
SonicWALL SMA1000 安全漏洞
V. Comments for CVE-2026-2859
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