Vulnerability · Published Sep 3, 2026 · Assigned by VulnCheck

CVE-2026-56126pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php

Medium 5.4

In plain English

A medium-severity cross-site scripting in pfSense CE from Netgate. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 64% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)1.1%top 35.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Netgate	pfSense Plus	0 – before 26.07
Netgate	pfSense CE	0 – before 2.9.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

Vendor Advisory vendor-advisory, patch
Plus Release Notes release-notes
CE Release Notes release-notes
https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-status-monitoring-php third-party-advisory