CVE-2026-111229: Netgate pfSense CE 2.7.0 through 2.9.0 Command Injection via Captive Portal HA Sync

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 6.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-15 · updated 2026-10-16
Weakness: CWE-78

Description

pfSense CE 2.7.0 through 2.9.0 contains a command injection vulnerability in services_captiveportal_hasync.php that allows users with only the Captive Portal HA privilege to execute commands as root. Attackers can set backwardsyncip to a malicious XMLRPC server returning connected_users with shell metacharacters in ip or mac fields, which captiveportal_load_pfctl passes unescaped to a pfctl shell command.

Affected products

Netgate pfSense CE: from 2.7.0 through 2.9.0

References

https://abraxaslabs.tech/research/pfsense-ce-leftovers
https://github.com/abraxas/pfsense-cp-ha-pfctl
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/captiveportal.inc#L2958-L2966
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/services_captiveportal_hasync.php#L106-L140
https://www.vulncheck.com/advisories/netgate-pfsense-ce-2.7.0-through-2.9.0-command-injection-via-captive-portal-ha-sync

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