CVE-2026-111231CWE-863broken-access-control

CVE-2026-111231

High · published October 15, 2026

CVSS v3.1

7.2

EPSS

Percentile

57.0

In the wild

Unconfirmed

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_confbak.php, or diag_backup.php can install a chosen config.xml to gain root-level code execution after reload or reboot.

The record

Technical detail

CVSS v3.1: 7.2 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0: 8.6 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS: 0.00825 · 57.0th percentile
Weakness: CWE-863 · Incorrect Authorization
Published: 2026-10-15T23:17Z

Affected products (1)

Product	Versions	Fixed in
pfsense/pfsense	≤ 2.9.0	—

References (5)

https://abraxaslabs.tech/research/pfsense-ce-leftovers · [email protected]https://github.com/abraxas/pfsense-config-readonly-restore · [email protected]https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/config.lib.inc#L588-L597 · [email protected]https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/config.lib.inc#L743-L798 · [email protected]https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-authorization-bypass-via-config-restore-and-config-install · [email protected]

EPSS history

Timeline

17 OCT 03:28Z
EPSS moved — → 1%
epss
15 OCT 18:46Z
Netgate pfSense CE through 2.9.0 Authorization Bypass via config_restore() and config_install()
cvelistv5
15 OCT 18:46Z
Netgate pfSense CE through 2.9.0 Authorization Bypass via config_restore() and config_install()
cvelistv5