CVE-2026-87664 Auth bypass in Fabric OS

What is CVE-2026-87664?

CVE-2026-87664 is a high-severity authentication bypass vulnerability in Broadcom Fabric Operating System, published on 8 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-306

Which versions are affected by CVE-2026-87664?

It affects 1 product.

Products include Broadcom Fabric Operating System.

How do I fix CVE-2026-87664?

No fix has been published for CVE-2026-87664 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-87664 being exploited?

There is no known exploitation of CVE-2026-87664 in the wild and no public exploit code.

Other vulnerabilities in Broadcom Fabric Operating System

• CVE-2025-1976 Broadcom Brocade Fabric OS Code Injection Exploited High 8.6
• CVE-2021-22555 Linux Kernel Heap Out-of-Bounds Write Exploited High 8.3
• CVE-2022-33186 Command injection in Brocade Fabric OS Critical 9.8
• CVE-2021-27797 Hardcoded credentials in Brocade Fabric OS Critical 9.8
• CVE-2020-15371 Code injection in Brocade Fabric OS Critical 9.8

All Broadcom Fabric Operating System vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-g9wq-5j4p-ph88.