CVE-2026-78463 Remote Desktop Client Remote Code Execution Vulnerability

High 8.8 Published 8 Sep 2026 Updated 14 Oct 2026

An unauthorized attacker can execute code over a network via improper code generation in the Remote Desktop Client.

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-2026-78463?

CVE-2026-78463 is a high-severity code injection vulnerability in Microsoft Remote Desktop client for Windows Desktop, published on 8 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

Improper control of generation of code ('code injection') in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Weakness: CWE-94

Which versions are affected by CVE-2026-78463?

It affects 1 product.

Products include Microsoft Remote Desktop Client.

How do I fix CVE-2026-78463?

No fix has been published for CVE-2026-78463 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-78463 being exploited?

There is no known exploitation of CVE-2026-78463 in the wild and no public exploit code.

Sources

Also known as GHSA-pgp6-8xfj-whr8.