CVE-2026-84188
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.
- Published Sep 1, 2026
- CVSS 4.8 medium
- 0.3% chance of exploitation in the next 30 days (EPSS)
- A fix is available