CVE-2026-26991
Medium · 4.8CVSS
4.8
EPSS
0.4%
Published
Feb 20, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Packagist | librenms/librenms | 0 | 26.2.0 |
Related vulnerabilities
- GHSA-5pqf-54qp-32wx LibreNMS /device-groups name Stored Cross-Site Scripting Same vulnerability
- CVE-2024-51092 LibreNMS before 24.10.0 allows a remote attacker to execute arbitrary code via OS command… Also affects librenms/librenms
- CVE-2026-26992 LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Also affects librenms/librenms
- CVE-2026-27016 LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Also affects librenms/librenms
- CVE-2026-26989 LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Also affects librenms/librenms
- CVE-2026-26990 LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Also affects librenms/librenms
- CVE-2026-26988 LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Also affects librenms/librenms
- CVE-2026-26987 LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Also affects librenms/librenms