---
id: CVE-2026-87681
title: >-
  An Access Control Bypass vulnerability exists in the Role-Based Access Control
  (RBAC) validation engine of Brocade Fabric OS versions before 10.0.1
summary: >-
  An Access Control Bypass vulnerability exists in the Role-Based Access Control
  (RBAC) validation engine of Brocade Fabric OS versions before 10.0.1. When
  processing certain management protocol operations, the RBAC engine incorrectly
  cate…
severity: high
cvss: 7.1
cvssVector: 'CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-269
vendor: Brocade
product: Fabric OS
affected:
  - fabric_os < 10.0.1
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T01:16:32.620'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87681'
references:
  - url: 'https://support.broadcom.com/external/content/SecurityAdvisories/0/39075'
    label: sirt@brocade.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-08T01:01:40.725Z'
---

## Overview

An Access Control Bypass vulnerability exists in the Role-Based Access Control (RBAC) validation engine of Brocade Fabric OS versions before 10.0.1. When processing certain management protocol operations, the RBAC engine incorrectly categorizes non-standard action opcodes during permission checks. This allows authenticated users with read-only management privileges to bypass access controls and execute restricted administrative operations.

## Remediation

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