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.

Affected: Packagist: librenms/librenms

### Summary **/port-groups name Stored Cross-Site Scripting**

- HTTP POST - Request-URI(s): "/port-groups" - Vulnerable parameter(s): "name" - Attacker must be authenticated with "admin" privileges. - 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 some relevant buttons like Edit and Delete.

### Details The vulnerability exists as the name of the port group is not sanitized of HTML/JavaScript-related characters or strings. When the delete button is rendered, the following template is used to render the page:

_resources/views/port-group/index.blade.php:_ ``` @extends('layouts.librenmsv1') @section('title', __('Port Groups')) @section('content') <div class="container-fluid"> <x-panel id="manage-port-groups-panel"> // [...Truncated...] @foreach($port_groups as $port_group) // [...Truncated...]

<button type="button" class="btn btn-danger btn- sm" title="{{ __('delete Port Group') }}" aria-label="{{ __('Delete') }}"

onclick="delete_pg(this, '{{ $port_group- >name }}', '{{ route('port-groups.destroy', $port_group->id) }}')"> // using the port's name in the Delete button functionality without sanitizing for XSS related characters/strings ```

As the device's name is not sanitized of HTML/JavaScript-related characters or strings, this can result in stored cross-site scripting.…