Privilege Escalation in OPNsense Firewall by OPNsense
CVE-2026-71490

7.1HIGH

Key Information:

Vendor

Opnsense

Status
Core
Vendor
CVE Published:
15 October 2026

What is CVE-2026-71490?

OPNsense, a FreeBSD-based firewall and routing platform, has a vulnerability that allows a user with both component write privileges and user-config-readonly access to bypass the read-only restriction. This flaw occurs due to the way OPNsense handles privilege checks using a flawed parser in the hasPrivilege() method. Consequently, users may be able to persist configuration changes against components that should be restricted. This issue does not affect group privileges, as their paths properly separate comma-separated values. The flaw has been addressed in version 26.1.11.

Affected Version(s)

core < 26.1.11

References

https://github.com/opnsense/core/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/opnsense/core/commit/578e025111161ffd0...
x_refsource_MISC
https://github.com/opnsense/core/commit/e15a884973746319e...
x_refsource_MISC

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.