Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://docs.netgate.com/downloads/pfSense-SA-26_09.packages.asc
- https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.html
- https://docs.netgate.com/pfsense/en/latest/releases/26-07.html
- https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-status-monit
FAQ
What is CVE-2026-56126?
CVE-2026-56126 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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.ph...
How severe is CVE-2026-56126?
CVE-2026-56126 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56126?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.