CVE-2024-21389 Microsoft Dynamics 365 (on-premises) Cross-site Scripting Vulnerability

High 7.6 Published 13 Feb 2024 Updated 10 Aug 2026

Attackers 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-2024-21389?

CVE-2024-21389 is a high-severity cross-site scripting vulnerability in Microsoft Dynamics 365, published on 13 Feb 2024. 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-2024-21389?

It affects 1 product.

Products include Microsoft Dynamics 365.

How do I fix CVE-2024-21389?

No fix has been published for CVE-2024-21389 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-2024-21389 being exploited?

There is no known exploitation of CVE-2024-21389 in the wild and no public exploit code.

All Microsoft Dynamics 365 vulnerabilities

Sources

Also known as GHSA-fv4p-ghwr-3g9x.