pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php (CVE-2026-56126) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-56126

pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php

Answer in brief

CVE-2026-56126 records a Unknown severity vulnerability in pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php. The current sources do not mark it as known exploited. The current feed maps Netgate/pfSense CE (generic), Netgate/pfSense Plus (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 3, 2026Updated Sep 3, 2026Source checked Sep 3, 2026First seen by HOL Sep 3, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Netgate/pfSense CE (generic), Netgate/pfSense Plus (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Netgate/pfSense CEgeneric	>=0 <2.9.0	2.9.0
Netgate/pfSense Plusgeneric	>=0 <26.07	26.07

Recommended response

Check inventory. Check lockfiles and deployed manifests for Netgate/pfSense CE, Netgate/pfSense Plus.
Review the reported fix. Update Netgate/pfSense CE to 2.9.0; Netgate/pfSense Plus to 26.07 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 3, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.