CVE-2026-73703 Cross-site scripting in Fabric Composer

High 8.8 Published 1 Sep 2026 Updated 2 Sep 2026

Unauthenticated attackers can inject malicious scripts into the HPE Fabric Composer web interface, allowing arbitrary code execution in victim browsers.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-73703?

CVE-2026-73703 is a high-severity cross-site scripting vulnerability in Arubanetworks Fabric Composer, published on 1 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A vulnerability in the web-based management interface of HPE Networking Fabric Composer could allow an unauthenticated adjacent attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface. A successful exploit could allow an attacker to execute arbitrary script code in a victim's browser in the context of the affected interface.

Weakness: CWE-79

Which versions are affected by CVE-2026-73703?

It affects 1 product.

Products include Arubanetworks Fabric Composer.

How do I fix CVE-2026-73703?

No fix has been published for CVE-2026-73703 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-73703 being exploited?

There is no known exploitation of CVE-2026-73703 in the wild and no public exploit code.

All Arubanetworks Fabric Composer vulnerabilities

Sources

Also known as GHSA-v8m8-3qg6-2wc8.