CVE-2026-87686 Auth bypass in Fabric OS
Attackers can bypass IP-based access controls via Host header spoofing to access sensitive device metadata without authentication in Brocade Fabric OS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-87686?
CVE-2026-87686 is a medium-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 and access control bypass vulnerability exists in the web server management interface of Brocade Fabric OS versions before 10.0.1. The web dispatcher routine evaluates internal management VLAN trust decisions using the client-supplied HTTP host header instead of the actual socket transport layer source IP address. Successful exploitation allows the attacker to bypass IP-filtering access control lists (ACLs) and obtain sensitive device metadata (such as model, serial number, hardware revision, and firmware version) without authentication.
Weakness: CWE-290
Which versions are affected by CVE-2026-87686?
It affects 1 product.
Products include Broadcom Fabric Operating System.
How do I fix CVE-2026-87686?
No fix has been published for CVE-2026-87686 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-2026-87686 being exploited?
There is no known exploitation of CVE-2026-87686 in the wild and no public exploit code.
Other vulnerabilities in Broadcom Fabric Operating System
Sources
Also known as GHSA-3whm-p6mj-fpf5.