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pfSense CVE-2026-56126

| EUVDEUVD-2026-70495 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-09-03 VulnCheck GHSA-2356-p4rp-xj6q
5.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.4 MEDIUM

Requires low-privilege authentication and victim page-visit; scope change reflects cross-user JavaScript execution affecting admin browser sessions.

3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

2
Patch available
Sep 03, 2026 - 16:01 EUVD
Analysis Generated
Sep 03, 2026 - 15:13 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Stored XSS in pfSense Plus before 26.07 and pfSense CE before 2.9.0 allows an authenticated user holding only the Status: Monitoring privilege to inject arbitrary JavaScript via unsanitized graph configuration POST parameters in /status_monitoring.php. The payload is persisted in the global pfSense XML configuration file and rendered unsanitized into a JavaScript string context, meaning it executes automatically in the browser of every subsequent visitor to the Status: Monitoring page - including full administrators. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to hold a valid pfSense account with the Status: Monitoring privilege assigned - a scoped, non-default low-privilege role that grants access only to the monitoring dashboard. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.1 (AV:N/AC:L/AT:N/PR:L/UI:P/SC:L/SI:L) accurately reflects the limited direct system impact - the vulnerable system itself retains integrity - but the score understates the privilege-escalation potential via browser session hijacking. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to pfSense Plus 26.07 or pfSense CE 2.9.0, which contain the vendor-released patches per the Netgate release notes at https://docs.netgate.com/pfsense/en/latest/releases/26-07.html and https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.html respectively. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-56126 vulnerability details – vuln.today

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