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CVE-2026-48550— Nagios Core / XI cmd.cgi Reflected XSS via NagFormId Parameter

Quick assessment

Affected
Nagios Enterprises, LLC. Nagios Core
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.

Nagios Enterprises Nagios是Nagios Enterprises公司的一款网络监控系统。 Nagios Enterprises Nagios 4.5.14之前版本存在跨站脚本漏洞，该漏洞源于cmd.cgi中NagFormId参数存在反射型跨站脚本漏洞，可能导致未经身份验证的远程攻击者构造恶意链接，当经过身份验证的用户点击后，在受害者浏览器中执行任意JavaScript。

CVSS 6.1 · Medium EPSS 0.44% · P36

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-2026-48550

Vulnerability Information
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Vulnerability Title
Nagios Core / XI cmd.cgi Reflected XSS via NagFormId Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to reflected cross-site scripting in cmd.cgi via the NagFormId parameter. An unauthenticated remote attacker can craft a malicious link that, when followed by an authenticated user, executes arbitrary JavaScript in the victim's browser.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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
Nagios Enterprises Nagios 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nagios Enterprises Nagios是Nagios Enterprises公司的一款网络监控系统。 Nagios Enterprises Nagios 4.5.14之前版本存在跨站脚本漏洞，该漏洞源于cmd.cgi中NagFormId参数存在反射型跨站脚本漏洞，可能导致未经身份验证的远程攻击者构造恶意链接，当经过身份验证的用户点击后，在受害者浏览器中执行任意JavaScript。
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-2026-48550

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III. Intelligence Information for CVE-2026-48550

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Vendor Advisories for CVE-2026-48550 (2)

Vendor Pages for CVE-2026-48550 (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-2026-48553 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-2026-48552 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-79

V. Comments for CVE-2026-48550

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