---
id: CVE-2026-71490
title: OPNsense is a FreeBSD based firewall and routing platform
summary: >-
  OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.11,
  OPNsense\Core\ACL::hasPrivilege() appends a directly assigned comma-separated
  <priv> value as one string and then uses an exact comparison when checking
  user-co…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L'
cwe:
  - CWE-863
vendor: opnsense
product: core
affected:
  - core < 26.1.11
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T16:18:19.723'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71490'
references:
  - url: >-
      https://github.com/opnsense/core/commit/578e025111161ffd03fd3fd0ccdac203be546505
    label: security-advisories@github.com
  - url: >-
      https://github.com/opnsense/core/commit/e15a884973746319e79bd2cd421e8a015cc3ddb9
    label: security-advisories@github.com
  - url: >-
      https://github.com/opnsense/core/commit/f674f4ff294a3f7c4cd0591563f6df47bea50034
    label: security-advisories@github.com
  - url: 'https://github.com/opnsense/core/security/advisories/GHSA-p9pr-782r-w2xw'
    label: security-advisories@github.com
  - url: 'https://github.com/opnsense/core/security/advisories/GHSA-p9pr-782r-w2xw'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-15T15:44:35.198725Z'
ingestedAt: '2026-10-15T16:13:11.023Z'
---

## Overview

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.11, OPNsense\Core\ACL::hasPrivilege() appends a directly assigned comma-separated <priv> value as one string and then uses an exact comparison when checking user-config-readonly. A user directly assigned both a component write privilege and user-config-readonly can therefore be treated as lacking the read-only restriction, and MVC APIs protected by throwReadOnly() can persist configuration changes for that component. Group privileges are not affected by the same parser flaw because the group path already splits comma-separated values. This issue is fixed in version 26.1.11.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.