Medium 5.4Published Sep 3, 2026

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

Updated under an hour ago (2026-10-19 07:30 UTC)

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It affects Netgate pfSense Plus and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Netgate pfSense Plus

Exploited in the last 30 days

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: 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Oct 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Netgate pfSense Plus netgate:pfsense_plus (from the name)	before 26.07	CNA record
Netgate pfSense CE netgate:pfsense_ce (from the name)	before 2.9.0	CNA record

References

https://docs.netgate.com/downloads/pfSense-SA-26_09.packages.ascvendor-advisory, patch
https://docs.netgate.com/pfsense/en/latest/releases/26-07.htmlrelease-notes
https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.htmlrelease-notes
https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-status-monitoring-phpthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.