What is the severity of CVE-2025-21393?

CVE-2025-21393 is classified as a moderate severity spoofing vulnerability affecting Microsoft SharePoint Server.

How do I fix CVE-2025-21393?

To fix CVE-2025-21393, you need to apply the latest security updates provided by Microsoft for your version of SharePoint.

Which versions of SharePoint are affected by CVE-2025-21393?

CVE-2025-21393 affects Microsoft SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016.

What type of vulnerability is CVE-2025-21393?

CVE-2025-21393 is a spoofing vulnerability that can allow an attacker to impersonate a legitimate user.

Can I mitigate CVE-2025-21393 without applying the patch?

Mitigation without applying the patch is not recommended as it may leave your system vulnerable to exploitation.

Vulnerability/
CVE-2025-21393

medium

6.3

CWE

EPSS

0.042%

14/1/2025

21/2/2025

CVE-2025-21393: Microsoft SharePoint Server Spoofing Vulnerability

First published: Tue Jan 14 2025(Updated: )

Microsoft SharePoint Server Spoofing Vulnerability

Credit: secure@microsoft.com

Affected Software	Affected Version	How to fix
Microsoft SharePoint Server Subscription Edition		fix available externally
Microsoft SharePoint Server 2019		fix available externally fix available externally
Microsoft SharePoint Server 2010	<16.0.17928.20356
Microsoft SharePoint Server 2010	=2016
Microsoft SharePoint Server 2010	=2019
Microsoft SharePoint Enterprise Server		fix available externally fix available externally

Remedy

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21393

Never miss a vulnerability like this again

Reference Links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21393 (Advisory)

Frequently Asked Questions

What is the severity of CVE-2025-21393?
CVE-2025-21393 is classified as a moderate severity spoofing vulnerability affecting Microsoft SharePoint Server.
How do I fix CVE-2025-21393?
To fix CVE-2025-21393, you need to apply the latest security updates provided by Microsoft for your version of SharePoint.
Which versions of SharePoint are affected by CVE-2025-21393?
CVE-2025-21393 affects Microsoft SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016.
What type of vulnerability is CVE-2025-21393?
CVE-2025-21393 is a spoofing vulnerability that can allow an attacker to impersonate a legitimate user.
Can I mitigate CVE-2025-21393 without applying the patch?
Mitigation without applying the patch is not recommended as it may leave your system vulnerable to exploitation.

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