CVE-2026-87663 Auth bypass in Fabric OS

What is CVE-2026-87663?

CVE-2026-87663 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

An authentication bypass and command injection vulnerability exists in the inter-switch remote execution service of Brocade Fabric OS versions before 9.2.2d and 10.0.0 through 10.0.0a1. When processing remote command execution IPC frames across the fabric, the receiving switch processes these commands at an elevated processing level without proper verification of transmitted parameters. This allows an attacker on a single fabric-connected switch to escalate privileges and execute arbitrary root commands locally or across other managed fabric members where remote execution functionality is enabled.

Weakness: CWE-290

Which versions are affected by CVE-2026-87663?

It affects 1 product.

Products include Broadcom Fabric Operating System.

How do I fix CVE-2026-87663?

No fix has been published for CVE-2026-87663 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-2026-87663 being exploited?

There is no known exploitation of CVE-2026-87663 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-c66x-7fmm-f2xw.