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

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

- **Severity:** High 8.7 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Oct 2026
- **Updated:** 8 Oct 2026
- **Also known as:** GHSA-8gf9-p92h-6gg3

## 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 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-85421?

It affects 1 product.


Products: 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.

## Is CVE-2026-85421 being exploited?

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

## Other vulnerabilities in Brocade Active Support Connectivity Gateway

- [CVE-2026-85489](https://insights.sbomify.com/CVE-2026-85489/): Missing authorization in Brocade Active Support Connectivity Gateway (high 8.7)
- [CVE-2026-85423](https://insights.sbomify.com/CVE-2026-85423/): A vulnerability has been identified in the data collection service of Brocade ASCG versions before 3.5.0. (high 8.6)
- [CVE-2026-85486](https://insights.sbomify.com/CVE-2026-85486/): Code injection in Brocade Active Support Connectivity Gateway (high 8.6)
- [CVE-2026-85487](https://insights.sbomify.com/CVE-2026-85487/): Path traversal in Brocade Active Support Connectivity Gateway (high 8.6)
- [CVE-2026-87424](https://insights.sbomify.com/CVE-2026-87424/): A vulnerability in the SupportLink API authentication component of Brocade ASCG versions prior to 3.5.0 allows an attacker to bypass authent (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85421 and fix it if it is affected.

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

Affected product: Brocade Active Support Connectivity Gateway. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-85421/ (Markdown: https://insights.sbomify.com/CVE-2026-85421/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85421
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85421
- OSV: https://osv.dev/vulnerability/CVE-2026-85421

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-85421/
Summaries are generated and may contain mistakes; the official description above is the record.