CVE-2026-56126Medium· 5.4▾ Sunlit

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

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score30/ 100 · Low

impact 29.7 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Sep 3, 2026

Updated

Sep 9, 2026

CVSS

5.4

Vendor

—

Product

—

CWE

CWE-79

Depth score

30 · Low

EPSS

0.37% · p31

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS history

Exploit-prediction probability, daily snapshots since Sep 5.

0.4% → 0.4%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 6 days

Sep 3, 2026Published
Disclosed via NVD
Sep 5, 2026EPSS first tracked
0.4%
Sep 9, 2026Record revised
Last analysed / modified upstream

CWE-79 #nvd

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

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