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CVE-2026-111233

Status: AnalyzedLow (2.3)—
Severity2.3Low · CVSS 4.0
Exploitation probability1.06 %higher than 64% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

Netgate pfSense CE 2.7.1 through 2.9.0 contains a reflected cross-site scripting vulnerability in firewall_rules.php that allows remote attackers to inject script via the unencoded if parameter. When the non-default Require Firewall Interface option is enabled, attackers can lure users with firewall rules privileges into opening a crafted GET link to execute script in the WebGUI with their privileges.

CVSS

Base score
2.3
Version
4.0
Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/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

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
1.06 %
Percentile among all scored CVEs
64
Score date
10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

XSS reflejado en firewall_rules.php por el parámetro 'if' sin codificar; el usuario debe abrir un enlace GET manipulado (UI:P) y el script se ejecuta en el WebGUI con sus privilegios.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Restrict Web-Based ContentUser TrainingPrivileged Account ManagementLimit Software InstallationExecution PreventionBehavior Prevention on Endpoint

Affected technologies (1)

Pfsense — Pfsense

CWEs

References

Show 5 references

Raw JSON (NVD)

Show
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