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Vulnerabilities

Security research · GHSA-p683-f7x2-pm4p

Authenticated Root Command Injection via Firmware Mirror Configuration in OPNsense

Published Oct 28, 2026 · catalog updated Oct 28, 2026 · Authenticated Root Command Injection

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for GHSA-p683-f7x2-pm4p. A missing EPSS score is not a low risk. Compare Authenticated Root Command Injection with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Authenticated Root Command Injection).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
High7.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Not established
Affected products
See sources for product scope

### Summary An authenticated command injection in OPNsense 26.7.7 allows a user with only the privilege to execute arbitrary shell commands with root-level privileges. The vulnerability happens when an attacker controlled firmware mirror URL is stored through . Then it is subsequently evaluated when the firmware information is retrieved from: (Or consequently anytime the firmware page of the webui loads). ### Details The OPNsense firmware management API allows a user with to modify the firmware mirror config. accepts a mirror URL from the attacker and the shell command substitution characters can survive validation and become part of the stored mirror url value. Whenever the firmware info is retrieved, the backend invokes . The function in the update utility processes the mirror value using: This causes embedded shell command substitution to be executed instead of treating the mirror URL strictly as data. The vulnerable execution chain is: 1. POST , store the crafted mirror URL. 2. GET , request firmware information. 3. Firmware backend invokes . 4. evaluates the stored URL. 5. The injected shell command executes with root privileges. The attacker can invoke both API endpoints using the same restricted firmware only API key, without an unrestricted administrator account. The payload persists in the firmware configuration and is evaluated again when the affected firmware information operation runs. Suspected root cause: Improper handling of untrusted firmware mirror configuration data before shell evaluation. **Confirmed affected system**: OPNsense Community Edition 26.7.7, amd64. The exact vulnerable version range and first patched release have not yet been established. --- AI was used during vulnerability discovery as well as some source code analysis. I independently reproduced and verified the vulnerability on an isolated OPNsense 26.7.7 VM, including the execution of the injected command and creation of the root owned file. If this vulnerability is confirmed and

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix GHSA-p683-f7x2-pm4p

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the inventory_github record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for GHSA-p683-f7x2-pm4p. A missing EPSS score is not a low risk. Compare Authenticated Root Command Injection with the linked advisory before you change production.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-78: OS Command Injection. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

OPNsense security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 28, 2026 · Maintainer security tabs

    Detected

    ### Summary An authenticated command injection in OPNsense 26.7.7 allows a user with only the privilege to execute arbitrary shell commands with root-level privileges. The vulnerability happens when an attacker controlled firmware mirror URL is stored through . Then it is subsequently evaluated when the firmware information is retrieved from: (Or consequently anytime the firmware page of the webui

Sources

  • Maintainer security tabsVendor advisoryGHSA-p683-f7x2-pm4p

    ### Summary An authenticated command injection in OPNsense 26.7.7 allows a user with only the privilege to execute arbitrary shell commands with root-level privileges. The vulnerability happens when an attacker controlled firmware mirror URL is stored through . Then it is subsequently evaluated when the firmware information is retrieved from: (Or consequently anytime the firmware page of the webui

    github.com

Freshness

Last verified in this catalog Oct 28, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Maintainer security tabsNov 2, 2026