CVE-2026-56126
pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php
- State
- Published
- Severity
- 5.1 Medium
- Published
- Sep 3, 2026
- Updated
- Oct 1, 2026
- Reserved
- Jun 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 5.4 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
pfSense PlusNetgate |
|
pfSense CENetgate |
|
References
- Vendor Advisoryvendor-advisorypatch
- Plus Release Notesrelease-notes
- CE Release Notesrelease-notes
- https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-status-monitoring-phpthird-party-advisory
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