CVE-2026-19766 Authentication Bypass leads to Administrative control of adjacent network hosts in HPE Networking Fabric Composer

Critical 9.6 Published 1 Sep 2026 Updated 2 Sep 2026

Unauthenticated adjacent attackers can bypass authentication to execute arbitrary code with privileged access on HPE Fabric Composer hosts.

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-2026-19766?

CVE-2026-19766 is a critical authentication bypass vulnerability in Arubanetworks Fabric Composer, published on 1 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An authentication bypass vulnerability exists in the underlying operating system of HPE Networking Fabric Composer. Successful exploitation could allow an unauthenticated adjacent attacker to execute arbitrary code as a privileged user on the underlying operating system, leading to complete compromise of the AFC host.

Weakness: CWE-287

Which versions are affected by CVE-2026-19766?

It affects 1 product.

Products include Arubanetworks Fabric Composer.

How do I fix CVE-2026-19766?

No fix has been published for CVE-2026-19766 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-2026-19766 being exploited?

There is no known exploitation of CVE-2026-19766 in the wild and no public exploit code.

All Arubanetworks Fabric Composer vulnerabilities

Sources

Also known as GHSA-cxhr-f495-3m45.