CVE-2026-48552

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.

Score

CVSS 3.1 5.4 Medium

Status

Awaiting Analysis - disclosure@vulncheck.com

Published

2026-08-12

Last modified

2026-08-14

Weaknesses

CWE-79

Affected products

• Nagios Core (Nagios)
• Nagios Xi (Nagios)

References

• https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog
• https://www.nagios.com/security-disclosures/nagios-core/
• https://www.vulncheck.com/advisories/nagios-core-xi-dom-based-xss-via-jsonquery-js