Description
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the device group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a device group, an HTTP POST request is sent to the Request-URI "/device-groups". The name of the newly created device group is stored in the value of the name parameter. After the device group is created, the entry is displayed along with relevant buttons such as Rediscover Devices, Edit, and Delete. This issue has been fixed in version 26.2.0.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_confirm
https://github.com/librenms/librenms/security/advisories/GHSA-5pqf-54qp-32wx
Issue Tracking x_refsource_misc
https://github.com/librenms/librenms/pull/19041
Patch x_refsource_misc
https://github.com/librenms/librenms/commit/64b31da444369213eb4559ec1c304ebfaa0ba12c
Release Notes x_refsource_misc
https://github.com/librenms/librenms/releases/tag/26.2.0
Scores
CVSS v3
4.8
EPSS
0.0000
EPSS Percentile
0.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (2)
librenms/librenms
< 26.2.0
librenms/librenms
0 - 26.2.0Packagist
Published
Feb 20, 2026
Tracked Since
Feb 20, 2026