CVE-2026-111231 is a vulnerability in Netgate Pfsense
Published on October 15, 2026
Netgate pfSense CE through 2.9.0 Authorization Bypass via config_restore() and config_install()
Netgate pfSense CE through 2.9.0 contains an authorization bypass vulnerability that allows read-only WebGUI users to replace config.xml because config_restore() and config_install() ignore the 'User - Config: Deny Config Write' privilege. Attackers holding page privileges for services_acb.php, uploadconfig.php, diag_confbak.php, or diag_backup.php can install a chosen config.xml to gain root-level code execution after reload or reboot.
Vulnerability Analysis
CVE-2026-111231 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-111231. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-111231 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-111231
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Affected Versions
Netgate pfSense CE:- Before and including 2.9.0 is affected.