CVE-2026-56126

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 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 Software

Weaknesses

• CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

• https://docs.netgate.com/downloads/pfSense-SA-26_09.packages.asc
• https://docs.netgate.com/pfsense/en/latest/releases/26-07.html
• https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.html
• https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-status-monitoring-php

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