Vulnerability · Published Feb 20, 2026 · Assigned by zdi

CVE-2026-2035Deciso OPNsense diag_backup.php filename Command Injection Remote Code Execution Vulnerability

Medium 6.8

In plain English

A medium-severity OS command injection in OPNsense from Deciso. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities).

Severity (CVSS 3.0)6.8Medium

Exploit odds (30 days)1.6%top 24.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Deciso	OPNsense	25.7

Weakness: CWE-78 · Vector: CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References

ZDI-26-078 x_research-advisory
vendor-provided URL vendor-advisory