Vulnerability Details CVE-2026-111233
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 39.9%
CVSS Severity
CVSS v3 Score 4.7
References
- https://abraxaslabs.tech/research/pfsense-ce-leftovers
- https://github.com/abraxas/pfsense-rules-if-xss
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/firewall_rules.php#L138-L146
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/firewall_rules.php#L391
- https://www.vulncheck.com/advisories/netgate-pfsense-ce-2.7.1-through-2.9.0-reflected-xss-via-firewall-rules-php