---
id: "CVE-2026-119409"
kind: "vulnerability"
aliases: ["CVE-2026-119409"]
title: "OPNsense: firmware mirror URL lets an admin-level user run commands as root"
severity: "high"
cvss: 8.6
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["firewall", "freebsd", "infrastructure", "opnsense"]
not_affected_if: ["no-firmware-privilege-users", "version-26.7.8-or-later"]
published_at: "2026-10-30T12:16:37+00:00"
first_seen_at: "2026-10-30T12:30:23+00:00"
updated_at: "2026-10-30T12:31:59+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119409", "first_seen_at": "2026-10-30T12:30:23+00:00"}]
---

# OPNsense: firmware mirror URL lets an admin-level user run commands as root

OPNsense before 26.7.8 lets a user with the System: Firmware privilege store a crafted firmware mirror URL that is evaluated by a shell update script. The attacker can execute commands as root and can disable package signature checks.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed OPNsense version in the web interface or with `opnsense-version`.
- Review which accounts hold the System: Firmware privilege.

## Fix

- OPNsense: move to `26.7.8` or later.

## Timeline

- 2026-10-30T12:30:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119409

## From the sources

OPNsense before 26.7.8 contains a command injection vulnerability that allows authenticated users with the System: Firmware privilege to execute commands as root by storing a malicious firmware mirror URL. Attackers can submit shell metacharacters through POST /api/core/firmware/set that opnsense-update evaluates with eval, and can also disable package signature verification through sed injection.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_