CVE-2026-48553— Nagios Core / XI Authenticated RCE via Custom-Variable Macro Injection
Quick assessment
Affected
Nagios Enterprises, LLC. Nagios Core
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
nagios core是Nagios公司开源的一款网络监控软件。 nagios core 4.5.13之前版本和Nagios XI 2026R1.5之前版本存在命令注入漏洞，该漏洞源于自定义变量宏注入问题，可能导致具有Nagios Remote Data Processor (NRDP)访问权限的经过身份验证的攻击者注入操作系统命令，从而执行任意代码。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Nagios Enterprises, LLC. | Nagios Core | < 4.5.13 |
affected |
| Nagios Enterprises, LLC. | Nagios XI | < 2026R1.5 |
affected |
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I. Basic Information for CVE-2026-48553
Vulnerability Information
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Vulnerability Title
Nagios Core / XI Authenticated RCE via Custom-Variable Macro Injection
Source: CVE Program / CVE List V5
Vulnerability Description
Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 are vulnerable to authenticated remote code execution via custom-variable macro injection through the Nagios Remote Data Processor (NRDP). When a custom variable defined on a host, service, or contact is referenced in a shell-executed command line, an authenticated attacker with NRDP access can inject OS commands through the macro value. Exploitation requires a non-default configuration in which a custom variable is defined and referenced in a shell-executed command.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
nagios core 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nagios core是Nagios公司开源的一款网络监控软件。 nagios core 4.5.13之前版本和Nagios XI 2026R1.5之前版本存在命令注入漏洞，该漏洞源于自定义变量宏注入问题，可能导致具有Nagios Remote Data Processor (NRDP)访问权限的经过身份验证的攻击者注入操作系统命令，从而执行任意代码。
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 |
|---|---|---|---|---|
| Nagios Enterprises, LLC. | Nagios Core | 0 ~ 4.5.13 | - |
|
| Nagios Enterprises, LLC. | Nagios XI | 0 ~ 2026R1.5 | - |
|
II. Public POCs for CVE-2026-48553
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Qwen3.6-35B-A3B
· 8321 chars
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III. Intelligence Information for CVE-2026-48553
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Vendor Advisories for CVE-2026-48553 (2)
Vendor Pages for CVE-2026-48553 (1)
Same Patch Batch · Nagios Enterprises, LLC. · 2026-08-12 · 5 CVEs total
| CVE-2026-48554 | 7.5 HIGH | Nagios Core / XI Authenticated RCE via Unfiltered NOTIFICATION-Family Macro Substitution |
| CVE-2026-48551 | 7.4 HIGH | Nagios Core / XI CSRF Protection Bypass via Double-Submit Cookie |
| CVE-2026-48550 | 6.1 MEDIUM | Nagios Core / XI cmd.cgi Reflected XSS via NagFormId Parameter |
| CVE-2026-48552 | 5.4 MEDIUM | Nagios Core / XI DOM-based XSS via jsonquery.js |
IV. Related Vulnerabilities
V. Comments for CVE-2026-48553
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