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CVE-2026-87659: CWE-306: Missing Authentication for Critical Function in Brocade Fabric OS

0
High
VulnerabilityCVE-2026-87659cvecve-2026-87659cwe-306
Published: 10/08/2026 (10/08/2026, 02:24:32 UTC)
Source: CVE Database V5
Vendor/Project: Brocade
Product: Fabric OS

Description

CVE-2026-87659 is a high-severity authorization bypass vulnerability in Brocade Fabric OS Management Server versions before 10.0.1. A compromised switch connected to the fabric can send crafted Fibre Channel vendor-unique CT management requests to bypass administrative authentication. This allows unauthorized peer switches to perform administrative actions such as resetting passwords, rebooting the system, and triggering firmware downloads.

CVSS v4.0

Score 7.1high

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
High
User Interaction
None
Vuln. Confidentiality
High
Vuln. Integrity
High
Vuln. Availability
High
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected software

Brocade

Fabric OS

Affected versions
>=0 <10.0.1

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/08/2026, 03:03:26 UTC

Technical Analysis

This vulnerability (CWE-306) affects Brocade Fabric OS Management Server handling in versions prior to 10.0.1. It allows an attacker with a compromised switch connected to the fabric to bypass administrative authentication by sending specially crafted inband Fibre Channel vendor-unique CT management requests. Exploitation enables unauthorized execution of critical administrative functions including password resets, system reboots, and firmware downloads on the target device.

Potential Impact

Successful exploitation results in unauthorized administrative control over the affected Brocade Fabric OS device. The attacker can reset administrative passwords, reboot the system, and initiate firmware downloads, potentially disrupting operations and compromising device integrity.

Mitigation Recommendations

A fix is available in Brocade Fabric OS version 10.0.1 and later. Users should upgrade to version 10.0.1 or newer to remediate this vulnerability. No vendor advisory content was provided to indicate alternative mitigations or temporary workarounds.

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Technical Details

Data Version
5.2
Assigner Short Name
brocade
Date Reserved
2026-09-08T22:51:12.105Z
Cvss Version
4.0
State
PUBLISHED

Threat ID: 6ac704982cdf04f656d7a12b

Added to database: 10/08/2026, 02:48:56 UTC

Last enriched: 10/08/2026, 03:03:26 UTC

Last updated: 10/08/2026, 03:08:23 UTC

Views: 4

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