CVE-2026-84189

High

Description

LibreNMS through 26.4.0 renders JSON fields (name, ip, model, author, commit message) returned by the admin-configurable Oxidized integration URL (oxidized.url) into the device showconfig page without applying htmlspecialchars(). An administrator who points the Oxidized URL at an attacker-controlled server (SSRF) can cause it to return malicious JSON, resulting in stored/persistent cross-site scripting affecting all users who view any device's showconfig tab. Fixed in 26.7.0.

SeverityHigh

CVSS8.1

Exploit probability—

ProductLibrenms/librenms

PublishedSep 1, 2026

First seenSep 1, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

librenms/librenms26.7.0 or later

Vendor advisories

github.com/librenms/librenms/security/advisories/GHSA-7gww-x7fh-jf9j

Affected products

Product	Affected versions	Fixed in
librenms/librenmsPackagist	v < 26.7.0	26.7.0

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