EUVD-2026-70496
GHSA-3c8g-23wp-3mx8
Severity by source
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
Low-privilege auth required (PR:L), victim must view log page (UI:R), impact crosses to victim's browser session (S:C), no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Firewall: Rules: Edit privilege to inject arbitrary JavaScript via the descr parameter in /firewall_rules_edit.php. The firewall rule description is stored in the pfSense XML configuration with only backslash-escaping applied and no HTML sanitization, then rendered without encoding in the firewall log table in /status_logs_filter.php. The payload executes in the browser of any user with the Status: Logs: Firewall privilege who views the affected log entries.
AnalysisAI
Stored cross-site scripting in pfSense Plus and pfSense CE allows an authenticated attacker holding the 'Firewall: Rules: Edit' privilege to inject arbitrary JavaScript via the descr parameter in /firewall_rules_edit.php. The injected payload is written to the pfSense XML configuration with only backslash-escaping applied and no HTML sanitization, then rendered unencoded in the firewall log table at /status_logs_filter.php, executing in the browser of any administrator holding the 'Status: Logs: Firewall' privilege who views the affected entries. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be authenticated to the pfSense web UI and hold the explicitly granted 'Firewall: Rules: Edit' privilege - this is a non-default, administrator-assigned role. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 (Medium) accurately captures the constrained exploitation path: the attacker must be authenticated with the specific 'Firewall: Rules: Edit' privilege (PR:L), and payload execution requires a second privileged victim with 'Status: Logs: Firewall' access to view the log table (UI:P). … 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 pfSense Plus to version 26.07 or later, or pfSense CE to version 2.9.0 or later; Netgate release notes confirm these as the fixing versions 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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