CVE-2026-26992

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the port group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a port group, an HTTP POST request is sent to the Request-URI "/port-groups". The name of the newly created port group is stored in the value of the name parameter. After the port group is created, the entry is displayed along with relevant buttons such as Edit and Delete. This issue has been fixed in version 26.2.0.

• CWE-79

• https://github.com/librenms/librenms/commit/882fe6f90ea504a3732f83caf89bba7850a5699fPatch
• https://github.com/librenms/librenms/pull/19042Issue Tracking
• https://github.com/librenms/librenms/releases/tag/26.2.0Product, Release Notes
• https://github.com/librenms/librenms/security/advisories/GHSA-93fx-g747-695xExploit, Third Party Advisory

Published

Feb 20, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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