CVE-2026-87686: Medium severity Brocade Fabric OS vulnerability
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Brocade Fabric OSto a version that resolves this vulnerability.Fixed in 10.0.1
Event History
Frequently Asked Questions
Which systems require remediation?
Brocade Fabric OS versions before 10.0.1 are affected. Systems running the web server management interface should be reviewed for exposure through IP-filtering ACLs.
What does an attacker need to exploit this issue?
The attacker needs network access consistent with the adjacent attack vector and access to the web management interface. No authentication, existing privileges, or user interaction is required.
What is the expected impact of successful exploitation?
An attacker can bypass IP-filtering ACLs and retrieve sensitive device metadata without authentication, including the model, serial number, hardware revision, and firmware version. The provided CVSS vector indicates confidentiality impact only, with no stated integrity or availability impact.