---
id: CVE-2026-84191
title: >-
  LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in
  VRF display pages where mplsVpnVrfDescription, vrf_name, and
  mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without
  sanitization
summary: >-
  LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in
  VRF display pages where mplsVpnVrfDescription, vrf_name, and
  mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without
  sanitization. Attacker…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-09-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:18:59.270'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84191'
references:
  - url: >-
      https://github.com/librenms/librenms/security/advisories/GHSA-g993-wffj-m3gv
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/librenms-before-26.5.0-stored-xss-via-snmp-vrf-fields
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00188
epssPercentile: 0.08682
ingestedAt: '2026-09-08T21:11:12.289Z'
---

## Overview

LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpnVrfDescription, vrf_name, and mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without sanitization. Attackers controlling a monitored network device can inject arbitrary JavaScript through SNMP responses that executes in the browser of any user viewing VRF-related pages.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.