CVE-2026-111233: Netgate pfSense CE 2.7.1 through 2.9.0 contains a reflected cross-site scripting vulnerability in firewall_rul

Routine

MEDIUM 4.7UPGRADE

CVE-2026-111233 is a medium-severity flaw (CVSS 4.7) affecting pfsense. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Netgate pfSense CE 2.7.1 through 2.9.0 contains a reflected cross-site scripting vulnerability in firewall_rules.php that allows remote attackers to inject script via the unencoded if parameter. When the non-default Require Firewall Interface option is enabled, attackers can lure users with firewall rules privileges into opening a crafted GET link to execute script in the WebGUI with their privileges.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 36%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-10-15
Last modified	2026-10-19

Publisher (CNA): VulnCheck · Vendor: pfsense

Last updated 2026-10-19 · 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
2026-10-19 20:41 UTCUpdated Record last modified

pfsense pfsense UPGRADE

Affected: >= 2.7.1 and <= 2.9.0

Fixed in: newer than 2.9.0

Safe to downgrade to: a release before 2.7.1

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.

3. If no update is available yet, DOWNGRADE to a release before 2.7.1 (Debian / Ubuntu)

apt-cache madison pfsense sudo apt install pfsense=<VERSION_BEFORE_2.7.1> sudo apt-mark hold pfsense

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pfsense sudo dnf downgrade pfsense-<VERSION_BEFORE_2.7.1> sudo dnf versionlock add pfsense

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-111233?

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

Is CVE-2026-111233 being exploited?

CVE-2026-111233 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-2026-111233 affect?

CVE-2026-111233 affects pfsense. Severity is medium (CVSS 4.7). Netgate pfSense CE 2.7.1 through 2.9.0 contains a reflected cross-site scripting vulnerability in firewall_rules.php that allows remote attackers to inject script via the unencoded if parameter. When the non-default Require Firewall Interfa

How urgent is CVE-2026-111233?

Priority 33/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities · pfSense and OPNsense vulnerabilities

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References

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