CVE-2026-48552

MEDIUM 5.4

Nagios Core / XI DOM-based XSS via jsonquery.js

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	nagios enterprises, llc.
Product	nagios core
Published	Aug 12, 2026
Last Updated	Aug 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

Nagios Enterprises, LLC. / Nagios Core

0 < 4.5.14

Nagios Enterprises, LLC. / Nagios XI

0 < 2026R1.7

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Zach Hanley of Horizon3.ai