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CVE-2026-48552— Nagios Core / XI DOM-based XSS via jsonquery.js

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 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之前版本存在跨站脚本漏洞，该漏洞源于jsonquery.js未对从存储字段反映的JSON字符串值进行清理便插入DOM，可能导致攻击者在受害者浏览器中运行任意JavaScript。

CVSS 5.4 · Medium EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

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-2026-48552

Vulnerability Information
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Vulnerability Title
Nagios Core / XI DOM-based XSS via jsonquery.js
Source: CVE Program / CVE List V5
Vulnerability Description
Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to DOM-based cross-site scripting in jsonquery.js. Unencoded JSON string values reflected from stored fields are inserted into the DOM without sanitization, allowing attackers to run arbitrary JavaScript in the victim's browser.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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 core 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于jsonquery.js未对从存储字段反映的JSON字符串值进行清理便插入DOM，可能导致攻击者在受害者浏览器中运行任意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-2026-48552

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III. Intelligence Information for CVE-2026-48552

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Vendor Advisories for CVE-2026-48552 (2)

Vendor Pages for CVE-2026-48552 (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-2026-48550 6.1 MEDIUM Nagios Core / XI cmd.cgi Reflected XSS via NagFormId Parameter

IV. Related Vulnerabilities

Same product: Nagios Core
Same vendor: Nagios Enterprises, LLC.
Same weakness: CWE-79

V. Comments for CVE-2026-48552

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