CVE-2026-84188: Librenms

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

LibreNMS versions <= 26.4.0 contain a stored cross-site scripting vulnerability in the graph_descr.<graphtype> configuration settings, which are echoed verbatim without HTML escaping in includes/html/pages/graphs.inc.php. An administrator can store a malicious HTML payload that executes in the browser of any authenticated user who views the affected graph type. The issue is fixed in version 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.