CVE-2026-111231
Pfsense: incorrect authorisation can lead to remote code execution
- Risk score
- 55/100
- CVSS
- 7.2 v3.1
- Exploit chance (30 days)
- 0.8%
- Published
- 15 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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_…
- Affected
- Pfsense
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Story map
At a glance
Pfsense: Amber, patch this week. Netgate pfSense CE 2.7.0 through 2.9.0 contains an OS command injection vulnerability that allows authenticated users with QinQ edit privilege to run commands by storing an unvalidated parent interface name. Attackers can save a crafted 'if' value, then edit the QinQ entry so it is interpolated into ifconfig shell com…
The flaws
- CVE-2026-111231: Incorrect authorisation can lead to remote code execution (CVSS 7.2 · EPSS 1%)
- CVE-2026-111214: OS command injection (CVSS 7.2 · EPSS 11%)
- CVE-2026-111225: OS command injection (CVSS 8.8 · EPSS 6%)
- CVE-2026-111218: OS command injection (CVSS 7.2 · EPSS 9%)
The fix
Fix: Apply the vendor's security update; see the linked advisory.
Who is exposed: Pfsense
Where it stands
- Public proof of concept
Connects to
- Same weakness: Incorrect authorisation (CWE-863). 335 other warnings in 30 days
- Same product: Earlier Pfsense warnings. 12 in the last 90 days
Why it is Yellow
- CVSS 7.2 high
References
- https://abraxaslabs.tech/research/pfsense-ce-leftovers
- https://github.com/abraxas/pfsense-config-readonly-restore
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/config.lib.inc#L588-L597
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/config.lib.inc#L743-L798
- https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-authorization-bypass-via-config-restore-and-config-install
Original description
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.
Last activity 15 Oct 2026. Patch Forecast updates every hour.