MSRC-CVE-2026-77908 — Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability

Summary

Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited. Customer action: Required.

Details

How could an attacker exploit this vulnerability?
An authenticated attacker with low-level access to an affected server could send a specially crafted request to execute code on the server. User interaction is not required.

Security updates
9.1.0048.0004 — https://support.microsoft.com/help/5123731

Vulnerabilities 1

High 8.8

CVE-2026-77908

Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability

Improper control of generation of code ('code injection') in Microsoft Dynamics 365 allows an authorized attacker to execute code over a network.

Microsoft Microsoft Dynamics 365 Customer Engagement V9.1

Sep 8, 2026

Revision history

2026-09-08 #1
Information published.

References

CVE-2026-77908 Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77908
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss