CVE-2026-87659: Brocade Fabric OS

High severity, CVSS 7.1. EPSS: 0.1% chance of exploitation in the next 30 days.

A critical authorization bypass vulnerability exists in the Management Server handling of Brocade Fabric OS versions before 10.0.1. A compromised switch connected to the fabric can transmit crafted inband Fibre Channel vendor-unique CT (Common Transport) management requests to bypass administrative authentication. Successful exploitation allows an unauthorized peer switch to execute administrative actions on the target device, including resetting administrative passwords, initiating system reboots, and triggering firmware downloads.

Affected products

• Brocade Fabric OS: before 10.0.1 (fixed in 10.0.1)

Published 2026-10-08. Last modified 2026-10-08.