CVE-2026-26992

MEDIUM EPSS 12.0%
Published Feb 20, 20264mo ago · Modified Jun 17, 20261w ago
5.1 CVSS 4.0
Medium
Find Similar
Published Feb 20, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.1
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
12.0% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
librenmslibrenms* <26.2.0

References 4

  • github.com https://github.com/librenms/librenms/commit/882fe6f90ea504a3732f83caf89bba7850a5699f
    Patch
  • github.com https://github.com/librenms/librenms/pull/19042
    Issue Tracking
  • github.com https://github.com/librenms/librenms/releases/tag/26.2.0
    ProductRelease Notes
  • github.com https://github.com/librenms/librenms/security/advisories/GHSA-93fx-g747-695x
    ExploitThird Party Advisory

Remediation

  • github.com https://github.com/librenms/librenms/commit/882fe6f90ea504a3732f83caf89bba7850a5699f
    Patch