CVE-2026-73700 Cross-site scripting in Fabric Composer

Critical 9.0 Published 1 Sep 2026 Updated 2 Sep 2026

Authenticated low-privilege users can inject scripts to execute code in administrators' browsers via the HPE Fabric Composer web interface.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-73700?

CVE-2026-73700 is a critical cross-site scripting vulnerability in Arubanetworks Fabric Composer, published on 1 Sep 2026. Any signed-in user can exploit it over the 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 authenticated low privilege operator user to conduct a stored cross-site scripting (XSS) attack against an administrative 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-2026-73700?

It affects 1 product.

Products include Arubanetworks Fabric Composer.

How do I fix CVE-2026-73700?

No fix has been published for CVE-2026-73700 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-2026-73700 being exploited?

There is no known exploitation of CVE-2026-73700 in the wild and no public exploit code.

All Arubanetworks Fabric Composer vulnerabilities

Sources

Also known as GHSA-57wh-vgwm-64qx.