Vulnerability · Published Feb 20, 2026 · Assigned by GitHub_M
CVE-2026-26992LibreNMS has Stored Cross-Site Scripting via unsanitized /port-groups name
Medium 5.1
In plain English
A medium-severity cross-site scripting in librenms from librenms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | librenms/librenms | 26.2.0 | GHSA-93fx-g747-695x |
Affected products (as reported)
Weakness: CWE-79 · 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
References
- https://github.com/librenms/librenms/security/advisories/GHSA-93fx-g747-695x x_refsource_CONFIRM
- https://github.com/librenms/librenms/pull/19042 x_refsource_MISC
- https://github.com/librenms/librenms/commit/882fe6f90ea504a3732f83caf89bba7850a5699f x_refsource_MISC
- https://github.com/librenms/librenms/releases/tag/26.2.0 x_refsource_MISC