What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-20 · updated 2026-06-17
• Weakness: CWE-78

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

• Deciso OPNsense: 25.7

References

• https://github.com/opnsense/core/commit/cb15c935137d05c86a1e6cf12af877e9c32a23af
• https://www.zerodayinitiative.com/advisories/ZDI-26-078/

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