CVE-2026-111230: Netgate pfSense CE through 2.9.0 Local File Read via Dynamic DNS Update URL

Severity: medium (CVSS 4.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-15 · updated 2026-10-19
Weakness: CWE-73

Description

Netgate pfSense CE through 2.9.0 contains a local file read vulnerability that allows users with the Dynamic DNS client privilege to read files as root by setting a file:// custom Update URL in services_dyndns_edit.php. Attackers can set a non-matching Result Match string so _checkStatus() logs file contents such as /conf/config.xml or /etc/master.passwd to the system log.

Affected products

Netgate pfSense CE: through 2.9.0

References

https://abraxaslabs.tech/research/pfsense-ce-leftovers
https://github.com/abraxas/pfsense-dyndns-file
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/dyndns.class#L2151-L2171
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/dyndns.class#L598-L616
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/services_dyndns_edit.php#L138-L141
https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-local-file-read-via-dynamic-dns-update-url

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