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CVE-2026-111231— Netgate pfSense CE through 2.9.0 Authorization Bypass via config_restore() and config_install()

Quick assessment

Affected

Netgate pfSense CE

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netgate pfSense CE 2.9.0 及之前版本存在一个授权绕过漏洞，允许只读 WebGUI 用户替换 config.xml 文件，因为 config_restore() 和 config_install() 忽略了“用户 - 配置：禁止写入配置”的权限设置。持有 services_acb.php、uploadconfig.php、diag_confbak.php 或 diag_backup.php 页面权限的攻擊者可以安装指定的 config.xml 文件，从而在系统重新加载或重启后获得 root 级

CVSS 7.2 · High Updated Oct 16, 2026

Possible ATT&CK Techniques 3 AI

T1059 · Command and Scripting Interpreter T1078 · Valid Accounts T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
Netgate	pfSense CE	`≤ 2.9.0`	affected

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Vulnerability Information

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Vulnerability Title

Netgate pfSense CE through 2.9.0 Authorization Bypass via config_restore() and config_install()

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

授权机制不正确

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Netgate	pfSense CE	0 ~ 2.9.0	-

II. Public POCs for CVE-2026-111231

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-111231

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Vendor Advisories for CVE-2026-111231 (1)

🔗 Netgate pfSense CE through 2.9.0 Authorization Bypass via config_restore() and config_install() | Advisories | VulnCheck third-party-advisory

Proof of Concept for CVE-2026-111231 (1)

🔗 GitHub - abraxas/pfsense-config-readonly-restore: pfSense CE 2.9.0-DEVELOPMENT - High - Remote - Privilege leftover - readonly config_install · GitHub exploit technical-description

https://www.cve.org/CVERecord?id=CVE-2026-111231

Same Patch Batch · Netgate · 2026-10-15 · 21 CVEs total

CVE-2026-110908	8.8 HIGH	pfSense FRR 2.0.2_1命令注入漏洞
CVE-2026-111224	7.5 HIGH	Netgate pfSense CE through 2.9.0 OS Command Injection via openvpn.connect_async.sh
CVE-2026-111223	7.2 HIGH	Netgate pfSense CE 2.7.0 through 2.9.0 Command Injection via IPsec Mobile Login Banner
CVE-2026-111218	7.2 HIGH	Netgate pfSense CE 2.7.0 through 2.9.0 OS Command Injection via Traffic Shaper Limiters
CVE-2026-111217	7.2 HIGH	Netgate pfSense CE through 2.9.0 OS Command Injection via CARP VHID
CVE-2026-111216	7.2 HIGH	Netgate pfSense CE through 2.9.0 OS Command Injection via Gateway Monitor IP
CVE-2026-111226	7.2 HIGH	Netgate pfSense CE 2.4.5 through 2.9.0 OS Command Injection via system_advanced_admin.php
CVE-2026-111215	7.2 HIGH	Netgate pfSense CE through 2.9.0 OS Command Injection via Wireless Parent Interface
CVE-2026-111229	7.2 HIGH	Netgate pfSense CE 2.7.0 through 2.9.0 Command Injection via Captive Portal HA Sync
CVE-2026-111220	7.2 HIGH	Netgate pfSense CE through 2.9.0 Crontab Injection via PPP Periodic Reset ptpid
CVE-2026-111214	7.2 HIGH	Netgate pfSense CE 2.7.0 through 2.9.0 OS Command Injection via interfaces_qinq_edit.php
CVE-2026-111219	6.6 MEDIUM	Netgate pfSense CE through 2.9.0 Command Injection via PPPoE Server Username
CVE-2026-111222	6.6 MEDIUM	Netgate pfSense CE through 2.9.0 php.ini Injection via Timezone Setting
CVE-2026-111221	6.6 MEDIUM	Netgate pfSense CE through 2.9.0 Command Injection via RADIUS Secret mpd.conf Injection
CVE-2026-111227	5.5 MEDIUM	Netgate pfSense CE through 2.9.0 CRLF Injection via services_unbound_acls.php
CVE-2026-111228	5.5 MEDIUM	Netgate pfSense CE 2.7.1 through 2.9.0 CRLF Injection via services_unbound_advanced.php
CVE-2026-111225	5.0 MEDIUM	Netgate pfSense CE 2.5.0 through 2.9.0 OS Command Injection via openvpn.learn-address.sh
CVE-2026-111230	4.9 MEDIUM	Netgate pfSense CE through 2.9.0 Local File Read via Dynamic DNS Update URL
CVE-2026-111232	4.8 MEDIUM	Netgate pfSense CE 2.3.0 through 2.9.0 Stored XSS via Separator Color
CVE-2026-111233	4.7 MEDIUM	Netgate pfSense CE 2.7.1 through 2.9.0 Reflected XSS via firewall_rules.php

IV. Related Vulnerabilities

Same product: pfSense CE

Same vendor: Netgate

Same weakness: CWE-863

V. Comments for CVE-2026-111231

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-111231— Netgate pfSense CE through 2.9.0 Authorization Bypass via config_restore() and config_install()

Quick assessment

Possible ATT&CK Techniques 3 AI

Affected Version Matrix 1

I. Basic Information for CVE-2026-111231

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-111231

III. Intelligence Information for CVE-2026-111231

Vendor Advisories for CVE-2026-111231 (1)

Proof of Concept for CVE-2026-111231 (1)

Same Patch Batch · Netgate · 2026-10-15 · 21 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-111231

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