CVE-2026-73731 Cross-site scripting in Fabric Composer

Medium 6.1 Published 1 Sep 2026 Updated 2 Sep 2026

Unauthenticated attackers can execute arbitrary scripts in victims' browsers via reflected XSS in the HPE Fabric Composer web interface.

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

What is CVE-2026-73731?

CVE-2026-73731 is a medium-severity cross-site scripting vulnerability in Arubanetworks Fabric Composer, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, 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 remote attacker to conduct a reflected 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-2026-73731?

It affects 1 product.

Products include Arubanetworks Fabric Composer.

How do I fix CVE-2026-73731?

No fix has been published for CVE-2026-73731 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-2026-73731 being exploited?

There is no known exploitation of CVE-2026-73731 in the wild and no public exploit code.

All Arubanetworks Fabric Composer vulnerabilities

Sources

Also known as GHSA-chcg-hgwr-hmx9.