CVE-2020-17021 Microsoft Dynamics 365 (on-premises) Cross-site Scripting Vulnerability

Medium 5.4 Published 11 Nov 2020 Updated 10 Sep 2024

An attacker can inject malicious scripts into Microsoft Dynamics 365 on-premises, potentially executing code or hijacking user sessions.

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-2020-17021?

CVE-2020-17021 is a medium-severity cross-site scripting vulnerability in Microsoft Dynamics 365, published on 11 Nov 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

Microsoft Dynamics 365 (on-premises) Cross-site Scripting Vulnerability

Weakness: CWE-79

Which versions are affected by CVE-2020-17021?

It affects 1 product.

Products include Microsoft Dynamics 365.

How do I fix CVE-2020-17021?

No fix has been published for CVE-2020-17021 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-2020-17021 being exploited?

There is no known exploitation of CVE-2020-17021 in the wild and no public exploit code.

All Microsoft Dynamics 365 vulnerabilities

Sources

Also known as GHSA-38h4-92v3-hhh5.