# CVE-2026-111226: Netgate pfSense CE 2.4.5 through 2.9.0 OS Command Injection via system_advanced_admin.php

> Authenticated administrators can execute arbitrary root commands via OS command injection in pfSense CE Login Protection settings.

- **Severity:** High 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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Oct 2026
- **Updated:** 26 Oct 2026
- **Also known as:** GHSA-fm76-5wvr-6cv2

## What is CVE-2026-111226?

CVE-2026-111226 is a high-severity command injection vulnerability in Netgate pfSense CE, published on 15 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

pfSense CE 2.4.5 through 2.9.0 contains an OS command injection vulnerability that allows authenticated WebGUI users with Advanced Admin Access privilege to execute commands as root via Login Protection settings. Attackers can submit sshguard threshold, block time, or detection time values containing newlines or $(...) that are written unvalidated to sshguard.conf and sourced as root on restart.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-111226?


## How do I fix CVE-2026-111226?

No fix has been published for CVE-2026-111226 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111226 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111226 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111226 and fix it if it is affected.

What it is: CVE-2026-111226 is a high-severity command injection vulnerability in Netgate pfSense CE, published on 15 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111226 exists.

Affected product: Netgate pfSense CE. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-111226/ (Markdown: https://insights.sbomify.com/CVE-2026-111226/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111226
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111226
- OSV: https://osv.dev/vulnerability/CVE-2026-111226

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111226/
Summaries are generated and may contain mistakes; the official description above is the record.