CVE-2026-85421 Missing authorization in Brocade Active Support Connectivity Gateway

High 8.7 Published 8 Oct 2026 Updated 8 Oct 2026

Unauthenticated attackers can issue control commands and modify configurations in Brocade ASCG, leading to complete compromise of the streaming service control plane.

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-2026-85421?

CVE-2026-85421 is a high-severity missing authorization vulnerability in Brocade Active Support Connectivity Gateway, 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

A critical security vulnerability has been identified in Brocade ASCG versions before 3.5.0. The HTTPS service fails to properly enforce authentication or access control checks on incoming requests. An unauthenticated attacker with network access can issue control commands, alter cluster states, and modify system configurations, leading to a complete compromise of the streaming service control plane.

Weakness: CWE-306

Which versions are affected by CVE-2026-85421?

It affects 1 product.

Products include Broadcom Brocade Active Support Connectivity Gateway.

How do I fix CVE-2026-85421?

No fix has been published for CVE-2026-85421 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-85421 being exploited?

There is no known exploitation of CVE-2026-85421 in the wild and no public exploit code.

Sources

Also known as GHSA-8gf9-p92h-6gg3.