CVE-2026-76657 Authentication Bypass in HPE Networking Fabric Composer API allows Administrative Access

Critical 10.0 Published 1 Sep 2026 Updated 1 Sep 2026

Unauthenticated remote attackers can bypass authentication to gain administrative privileges and compromise the HPE Networking Fabric Composer host.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-76657?

CVE-2026-76657 is a critical authentication bypass vulnerability in Arubanetworks Fabric Composer, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vulnerabilities have been identified in the API of HPE Networking Fabric Composer that could potentially allow an unauthenticated remote attacker to circumvent existing authentication controls. Successful exploitation could allow an attacker to gain administrative privileges leading to complete compromise of the HPE Networking Fabric Composer host.

Weakness: CWE-287

Which versions are affected by CVE-2026-76657?

It affects 1 product.

Products include Arubanetworks Fabric Composer.

How do I fix CVE-2026-76657?

No fix has been published for CVE-2026-76657 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-2026-76657 being exploited?

There is no known exploitation of CVE-2026-76657 in the wild and no public exploit code.

All Arubanetworks Fabric Composer vulnerabilities

Sources

Also known as GHSA-3634-p2j5-54h2.