CVE-2026-84189: Librenms

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Librenms Librenms: before 26.7.0 (fixed in 26.7.0)

Published 2026-09-01. Last modified 2026-10-08.