Incorrect authorization in OPNsense - CVE-2026-71490
Published: July 3, 2026 / Updated: October 16, 2026
Vulnerability identifier: #VU136831
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-71490
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to bypass authorization checks.
The vulnerability exists due to the error within interaction between "OPNsenseCoreACL::hasPrivilege()" and MVC API "throwReadOnly()" checks. A remote user can bypass intended access restrictions and modify configuration.
Affected software
OPNsense
How to mitigate CVE-2026-71490
Install updates from vendor's website.
OPNsense - addressed in versions 26.1.11, 26.4.1p1