Medium [CVE-2026-56126] pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php
This medium-severity Netgate pfSense advisory covers CVE-2026-56126 affecting pfSense Plus, pfSense CE.
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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 products named by the advisory: pfSense CE.
- pfSense Plus before 26.07
- pfSense CE before 2.9.0
Official advisory · high-confidence parse· fetched 52 minutes ago·verify at source
- 26.07
- 2.9.0
Official advisory · high-confidence parse· fetched 52 minutes ago·verify at source
Mitigation
Upgrade to a fixed release: 26.07, 2.9.0. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 52 minutes ago·verify at source
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