---
id: CVE-2026-87670
title: >-
  An authorization logic vulnerability exists in the Brocade Fabric OS versions
  before 10.0.1 REST API gateway
summary: >-
  An authorization logic vulnerability exists in the Brocade Fabric OS versions
  before 10.0.1 REST API gateway. The internal gate guarding restricted
  management endpoints relies exclusively on client-controlled HTTP headers. An
  authenticat…
severity: medium
cvss: 5.1
cvssVector: 'CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-290
vendor: Brocade
product: Fabric OS
affected:
  - fabric_os < 10.0.1
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T03:16:36.403'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87670'
references:
  - url: 'https://support.broadcom.com/external/content/SecurityAdvisories/0/39140'
    label: sirt@brocade.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-08T03:03:35.542Z'
---

## Overview

An authorization logic vulnerability exists in the Brocade Fabric OS versions before 10.0.1 REST API gateway. The internal gate guarding restricted management endpoints relies exclusively on client-controlled HTTP headers. An authenticated user with any valid REST session can spoof these headers to gain unauthorized access to internal management endpoints. This allows low-privilege users to view sensitive chassis metadata, hardware memory patrolling state, and firmware integrity audit logs.

## Remediation

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