CVE-2020-3997 Cross-site scripting in VMware Horizon Server

Medium 5.4 Published 23 Oct 2020 Updated 4 Aug 2024

An attacker can inject malicious scripts into VMware Horizon Server, potentially executing code in the context of other users.

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-2020-3997?

CVE-2020-3997 is a medium-severity cross-site scripting vulnerability in VMware Horizon Server, published on 23 Oct 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

VMware Horizon Server (7.x prior to 7.10.3 or 7.13.0) contains a Cross Site Scripting (XSS) vulnerability. Successful exploitation of this issue may allow an attacker to inject malicious script which will be executed.

Weakness: CWE-79

Which versions are affected by CVE-2020-3997?

It affects 1 product.

Products include Vmware Horizon.

How do I fix CVE-2020-3997?

No fix has been published for CVE-2020-3997 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-2020-3997 being exploited?

There is no known exploitation of CVE-2020-3997 in the wild and no public exploit code.

Sources

Also known as GHSA-2g97-qvhf-wqw3.