EUVD-2026-70498
GHSA-xqh2-9r6g-5jrx
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
Stored XSS via authenticated schedule edit requires victim admin to load the rules page (UI:R) and crosses scope (S:C) to affect another admin's browser session with low C/I impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Firewall: Schedules: Edit privilege to inject arbitrary JavaScript via the descr parameter in /firewall_schedule_edit.php. The schedule description is stored without HTML sanitization and subsequently inserted into an HTML attribute value in /firewall_rules.php with only single-quote escaping applied, permitting double-quote breakout. The payload executes in the browser of any user with the Firewall: Rules privilege who views the rules list with the affected schedule attached.
AnalysisAI
Stored cross-site scripting in pfSense Plus before 26.07 and CE before 2.9.0 allows an authenticated attacker holding the Firewall: Schedules: Edit privilege to inject arbitrary JavaScript via the schedule description field in /firewall_schedule_edit.php. The description is written to backend storage without HTML sanitization, and when rendered in /firewall_rules.php only single-quote escaping is applied - insufficient to prevent double-quote-based breakout from an HTML attribute context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two simultaneous conditions are required: (1) the attacker must hold an authenticated pfSense session with the Firewall: Schedules: Edit privilege - a delegated sub-administrator role, not necessarily full super-admin access - enabling them to submit a malicious `descr` value via /firewall_schedule_edit.php; and (2) a separate user holding the Firewall: Rules privilege must passively load /firewall_rules.php while a firewall rule referencing the poisoned schedule is present in the configuration. … 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/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N) is an accurate characterization: exploitation requires both a low-privileged authenticated account and passive victim interaction, substantially narrowing the exploitable population relative to unauthenticated flaws. … 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 and pfSense CE to version 2.9.0 or later; both fix versions are documented in official 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. |
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External POC / Exploit Code
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