Netgate pfSense CE up to 2.9.0 Config Restore services_acb.php config_restore/config_install authorization

Summaryinfo

A vulnerability was found in Netgate pfSense CE up to 2.9.0. It has been declared as very critical. This affects the function config_restore/config_install of the file services_acb.php of the component Config Restore. The manipulation results in authorization. This vulnerability is identified as CVE-2026-111231. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Netgate pfSense CE up to 2.9.0. It has been classified as very critical. Affected is the function config_restore/config_install of the file services_acb.php of the component Config Restore. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-111231 since 10/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/15/2026).

By approaching the search of inurl:services_acb.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Firewall Software

Vendor

• Netgate

Name

• pfSense CE

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9.0

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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