CVE-2021-40440 : What You Need to Know

This CVE article provides details about the Microsoft Dynamics Business Central Cross-site Scripting Vulnerability.

Understanding CVE-2021-40440

This section delves into the impact, technical details, and mitigation strategies related to CVE-2021-40440.

What is CVE-2021-40440?

CVE-2021-40440 refers to a Cross-site Scripting Vulnerability in Microsoft Dynamics Business Central.

The Impact of CVE-2021-40440

This vulnerability has a base severity of MEDIUM with a CVSS base score of 5.4. It falls under the impact type of Spoofing.

Technical Details of CVE-2021-40440

This section outlines the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability enables attackers to execute malicious scripts in the context of the user's session.

Affected Systems and Versions

Vendor: Microsoft

Affected Product: Microsoft Dynamics 365 Business Central 2020 Release Wave 2 - Update 17.10

Affected Version: 17.0.0.0 (less than App Build 17.10.29463, Platform Build 17.0.29460)

Platform: Unknown

Vendor: Microsoft

Affected Product: Microsoft Dynamics 365 Business Central 2021 Release Wave 1 - Update 18.5

Affected Version: 18.0.0.0 (less than App Build 18.5.29545, Platform Build 18.0.29486)

Platform: Unknown

Exploitation Mechanism

The vulnerability can be exploited by enticing a user to click on a specially crafted link that executes the malicious script.

Mitigation and Prevention

In this section, you'll find guidance on immediate steps, long-term security practices, and the importance of patching.

Immediate Steps to Take

Update affected systems to the latest patched versions.
Educate users about the risks of clicking on unknown links.

Long-Term Security Practices

Implement secure coding practices to prevent XSS vulnerabilities.
Regularly conduct security training for users and developers.

Patching and Updates

Microsoft may release security updates to address this vulnerability, so regularly check for and apply patches to mitigate risks.