Brocade Fabric OS up to 9.2.2c/10.0.0a1 Web Management Daemon improper authorization

Summaryinfo

A vulnerability identified as very critical has been detected in Brocade Fabric OS up to 9.2.2c/10.0.0a1. This affects an unknown part of the component Web Management Daemon. Performing a manipulation results in improper authorization. This vulnerability was named CVE-2026-87664. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Brocade Fabric OS up to 9.2.2c/10.0.0a1. This affects some unknown functionality of the component Web Management Daemon. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A session context forgery vulnerability exists in the web management daemon of Brocade Fabric OS versions 9.2.2d and 10.0.0 through 10.0.0a1. When processing local inter-process communication (IPC) storage callbacks, the service accepts and registers session structures including administrative role permissions, user identifiers, and authorization flags—without verifying the identity or authenticity of the sending process. An attacker can obtain elevated administrative privileges on the web management interface without legitimate authentication.

It is possible to read the advisory at support.broadcom.com. This vulnerability is uniquely identified as CVE-2026-87664 since 09/09/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/08/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 9.2.2d eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-3817). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Broadcom Fabric OS

Productinfo

Vendor

• Brocade

Name

• Fabric OS

Version

• 9.2.2a
• 9.2.2b
• 9.2.2c
• 10.0.0a1

License

• commercial

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Be aware that VulDB is the high quality source for vulnerability data.

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