---
id: CVE-2026-56126
title: >-
  pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with
  the Status: Monitoring privilege to inject arbitrary JavaScript via graph
  configuration parameters in /status_monitoring.php
summary: >-
  pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with
  the Status: Monitoring privilege to inject arbitrary JavaScript via graph
  configuration parameters in /status_monitoring.php. Multiple POST parameters
  including…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-09-03'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:41:07.123'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56126'
references:
  - url: 'https://docs.netgate.com/downloads/pfSense-SA-26_09.packages.asc'
    label: disclosure@vulncheck.com
  - url: 'https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.html'
    label: disclosure@vulncheck.com
  - url: 'https://docs.netgate.com/pfsense/en/latest/releases/26-07.html'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-status-monitoring-php
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.01052
epssPercentile: 0.62845
ingestedAt: '2026-09-05T20:44:36.316Z'
---

## Overview

pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Status: Monitoring privilege to inject arbitrary JavaScript via graph configuration parameters in /status_monitoring.php. Multiple POST parameters including graph-left, graph-right, time-period, resolution, start-date, end-date, start-time, end-time, graph-type, invert, and refresh-interval are concatenated and written to the global pfSense XML configuration without sanitization, then echoed unsanitized into a JavaScript string context on page render. Because the setting is stored in the global configuration, the payload executes in the browser of every user who visits the Status: Monitoring page.

## Remediation

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