CVE-2026-111231: Netgate pfSense CE through 2.9.0 contains an authorization bypass vulnerability that allows read-only WebGUI u

Q: How do I fix CVE-2026-111231?

pfsense: upgrade to newer than 2.9.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-111231 being exploited?

CVE-2026-111231 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-111231 affect?

CVE-2026-111231 affects pfsense. Severity is high (CVSS 7.2). 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.

This month

HIGH 7.2UPGRADE

CVE-2026-111231 is a high-severity flaw (CVSS 7.2) affecting pfsense. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-10-15
Last modified	2026-10-26

Publisher (CNA): VulnCheck · Vendor: pfsense

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-15 19:17 UTCPublished CVE record published
2026-10-26 16:17 UTCUpdated Record last modified

pfsense pfsense UPGRADE

Affected: <= 2.9.0

Fixed in: newer than 2.9.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pfsense || rpm -q pfsense || pfsense --version

2. UPGRADE to newer than 2.9.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pfsense

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pfsense

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-111231?

pfsense: upgrade to newer than 2.9.0. Exact commands for each OS are on this page.

Is CVE-2026-111231 being exploited?

CVE-2026-111231 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-111231 affect?

CVE-2026-111231 affects pfsense. Severity is high (CVSS 7.2). 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.

How urgent is CVE-2026-111231?

Priority 40/100. High severity

Software pages

PHP vulnerabilities · pfSense and OPNsense vulnerabilities

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References

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