CVE-2026-87659
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Broadcom Fabric Operating System
PublishedOct 8, 2026
First seenOct 8, 2026
Weakness typeCWE-306Missing authentication for critical function
How to fix
Update
- broadcom fabric_operating_system10.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| broadcom fabric_operating_system | v < 10.0.1 | 10.0.1 |
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