CVE-2026-2035
Received Received - Intake
Command Injection in OPNsense diag_backup.php Enables RCE

Publication date: 2026-02-20

Last updated on: 2026-02-20

Assigner: Zero Day Initiative

Description
Deciso OPNsense diag_backup.php filename Command Injection Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Deciso OPNsense. Authentication is required to exploit this vulnerability. The specific flaw exists within the handling of backup configuration files. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-28131.
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Meta Information
Published
2026-02-20
Last Modified
2026-02-20
Generated
2026-06-16
AI Q&A
2026-02-21
EPSS Evaluated
2026-06-14
NVD
CVE-2026-2035
EUVD
EUVD-2026-7777
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
deciso opnsense *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
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Impact Analysis

Exploiting this vulnerability allows an attacker to execute arbitrary code as the root user on the affected system. This can lead to full system compromise, including unauthorized access, data theft, modification or deletion of data, disruption of services, and potentially using the compromised system as a foothold to attack other systems within the network.

Executive Summary

This vulnerability exists in Deciso OPNsense's diag_backup.php file and is a command injection remote code execution flaw. It occurs because the software does not properly validate a user-supplied string before using it in a system call related to backup configuration files. An attacker who is network-adjacent and authenticated can exploit this flaw to execute arbitrary code with root privileges on the affected system.

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