---
id: CVE-2026-84192
title: >-
  LibreNMS before 26.3.1 contains a stored cross-site scripting vulnerability in
  legacy PHP templates that output SNMP-sourced and syslog-sourced data without
  escaping
summary: >-
  LibreNMS before 26.3.1 contains a stored cross-site scripting vulnerability in
  legacy PHP templates that output SNMP-sourced and syslog-sourced data without
  escaping. An attacker who controls a monitored network device can inject
  arbitra…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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-2026-84192'
references:
  - url: >-
      https://github.com/librenms/librenms/security/advisories/GHSA-7w8c-qgxg-m7jx
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/librenms-before-26.3.1-stored-xss-via-snmp-syslog-data
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/librenms/librenms/security/advisories/GHSA-7w8c-qgxg-m7jx
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00237
epssPercentile: 0.15001
ingestedAt: '2026-09-08T21:11:12.289Z'
---

## Overview

LibreNMS before 26.3.1 contains a stored cross-site scripting vulnerability in legacy PHP templates that output SNMP-sourced and syslog-sourced data without escaping. An attacker who controls a monitored network device can inject arbitrary JavaScript through SNMP interface descriptions or syslog program fields that executes when authenticated users view affected pages.

## Remediation

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