ZDI-CAN-28131: ZDI-26-078: 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.
Other sources
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Deciso OPNsense. Authentication is required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 6.8. The following CVEs are assigned: CVE-2026-2035.
— ZDI
Affected Software
Event History
Frequently Asked Questions
What is the severity of ZDI-CAN-28131?
ZDI-CAN-28131 has a high severity due to its potential for remote code execution.
How do I fix ZDI-CAN-28131?
To fix ZDI-CAN-28131, update to the latest version of Deciso OPNsense that contains the security patch.
Who is affected by ZDI-CAN-28131?
All installations of Deciso OPNsense that have authentication enabled are affected by ZDI-CAN-28131.
What type of vulnerability is ZDI-CAN-28131?
ZDI-CAN-28131 is a command injection vulnerability that allows for remote code execution.
Is authentication required to exploit ZDI-CAN-28131?
Yes, authentication is required for an attacker to exploit ZDI-CAN-28131.