PT-2026-7946 · Deciso · Opnsense

Alex Williams · Published 2026-02-12 · Updated 2026-02-20 · CVE-2026-2035

Positive Technologies (AI Summary)

CVSS v3.1

6.8

Medium

Base vector

AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Deciso OPNsense (affected versions not specified)

Description A flaw exists in the handling of backup configuration files within Deciso OPNsense. The issue stems from insufficient validation of user-provided input before it is used in a system call, potentially allowing network-adjacent attackers to execute arbitrary code. Successful exploitation requires authentication and results in code execution with root privileges. The vulnerable file is diag backup.php. The vulnerability was identified as ZDI-CAN-28131.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

CVE-2026-2035

ZDI-26-078

Affected Products

Opnsense

References · 5

• https://github.com/opnsense/core/commit/cb15c935137d05c86a1e6cf12af877e9c32a23af · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-26-078 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-2035 · Security Note
• https://osv.dev/vulnerability/CVE-2026-2035 · Vendor Advisory
• https://twitter.com/CVEnew/status/2024988737831313610 · Twitter Post