CVE-2026-26991CWE-79

LibreNMS vulnerable to Stored Cross-site Scripting through unsanitized /device-groups name

Medium · published February 20, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
29.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00371 · 29.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-02-20T02:21Z
EPSS history
Timeline
  • 20 FEB 02:21Z
    LibreNMS vulnerable to Stored Cross-site Scripting through unsanitized /device-groups name
    cvelistv5