TI-2026-40504 Aliases CVE-2026-56126 GHSA-2356-p4rp-xj6q

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

LOW 25CWE-79Published 2026-09-03 · Updated 2026-10-01

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: None · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01052 64th percentileScored 2026-11-07

Fix Fixed pfSense Plus (Netgate): 26.07pfSense CE (Netgate): 2.9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Netgate	pfSense Plus	before 26.07	26.07	Patch available	CNA
Netgate	pfSense CE	before 2.9.0	2.9.0	Patch available	CNA

pfSense Plus VendorNetgate Affected before 26.07 Fixed in 26.07 Patch available CNA
pfSense CE VendorNetgate Affected before 2.9.0 Fixed in 2.9.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:pfsense:pfsense::::::::	—	—	pfSense

cpe:2.3:a:pfsense:pfsense:*:*:*:*:*:*:*:* Versions — — ·pfSense

Remediation

Fix · CNA pfSense Plus (Netgate) Fixed in 26.07
Fix · CNA pfSense CE (Netgate) Fixed in 2.9.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-09-03
Netgate pfSense CE, pfSense Plus 2.9.0, 26.07
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2026-40506 pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_schedule_edit.phpPriority LOW 25
- TI-2026-40505 pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_rules_edit.phpPriority LOW 25
Show all 3 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-56126
2026-10-03 Alias added: GHSA-2356-p4rp-xj6q

References

Patch 1

Vendor Advisory

Other 2

TI-2022-13704 pfSense pfBlockerNG through 2.1.4_26 allows remote attackers to execute arbitrary OS… CVSS 3.1CRITICAL 9.8
TI-2023-12003 A command injection vulnerability in the function restore_rrddata() of Netgate pfSense… CVSS 3.1HIGH 8.8
TI-2024-31010 A cross-site scripting (XSS) vulnerability in pfsense v2.5.2 allows attackers to execute… CVSS 3.1CRITICAL 9.3
TI-2023-11923 Improper restriction of excessive authentication attempts in the SSHGuard component of… CVSS 3.1CRITICAL 9.8
TI-2023-26046 An issue in Netgate pfSense Plus v.23.05.1 and before and pfSense CE v.2.7.0 allows a… CVSS 3.1HIGH 8.8
TI-2023-22567 An issue in Netgate pfSense v.2.7.0 allows a remote attacker to execute arbitrary code… CVSS 3.1HIGH 8.8

See all 92 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences