What’s Vulnerable › Vulnerabilities

CVE-2021-40457: Microsoft Dynamics 365 Customer Engagement Cross-Site Scripting Vulnerability

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-13 · updated 2026-06-17
• Weakness: CWE-79

Description

Microsoft Dynamics 365 Customer Engagement Cross-Site Scripting Vulnerability

Affected products

• Microsoft Dynamics 365 (on-premises) version 9.0: 9.0, 9.1
• Microsoft Dynamics 365 (on-premises) version 9.0: from 9.0 before 9.1.4 — fixed in 9.1.4

How to fix

Upgrade to a fixed version: Microsoft Dynamics 365 (on-premises) version 9.0 9.1.4. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40457
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40457

Get alerted when CVE-2021-40457 or the next vulnerability affects your stack