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CVE-2026-48554— Nagios Core / XI Authenticated RCE via Unfiltered NOTIFICATION-Family Macro Substitution

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 4.5.14之前版本和Nagios XI 2026R1.7之前版本存在命令注入漏洞，该漏洞源于通过com_data参数进行未经过滤的NOTIFICATION宏替换，可能导致已认证的UI用户以nagios用户身份执行任意命令。

CVSS 7.5 · High EPSS 0.97% · P60

Affected Version Matrix 2

VendorProduct Version RangeStatus
Nagios Enterprises, LLC. Nagios Core < 4.5.14 affected
Nagios Enterprises, LLC. Nagios XI < 2026R1.7 affected
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I. Basic Information for CVE-2026-48554

Vulnerability Information
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Vulnerability Title
Nagios Core / XI Authenticated RCE via Unfiltered NOTIFICATION-Family Macro Substitution
Source: CVE Program / CVE List V5
Vulnerability Description
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to authenticated remote code execution via unfiltered NOTIFICATION-family macro substitution through the com_data parameter. When a notification command references $NOTIFICATIONCOMMENT$ or $NOTIFICATIONAUTHOR$ in a shell-reachable position, authenticated UI users can run arbitrary commands as the nagios user. Exploitation requires a non-default configuration in which a notification command references these macros in a shell-executed command line.
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 4.5.14之前版本和Nagios XI 2026R1.7之前版本存在命令注入漏洞，该漏洞源于通过com_data参数进行未经过滤的NOTIFICATION宏替换，可能导致已认证的UI用户以nagios用户身份执行任意命令。
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 ~ 4.5.14 -
Nagios Enterprises, LLC. Nagios XI 0 ~ 2026R1.7 -

II. Public POCs for CVE-2026-48554

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8874 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-48554

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Vendor Advisories for CVE-2026-48554 (2)

Vendor Pages for CVE-2026-48554 (1)

Same Patch Batch · Nagios Enterprises, LLC. · 2026-08-12 · 5 CVEs total

CVE-2026-48553 7.5 HIGH Nagios Core / XI Authenticated RCE via Custom-Variable Macro Injection
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

Same product: Nagios Core
Same vendor: Nagios Enterprises, LLC.
Same weakness: CWE-78

V. Comments for CVE-2026-48554

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