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

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-09-08

Description

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

FAQ

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.

Affected Products (1)

Microsoft Dynamics

• Microsoft Dynamics 365 Customer Engagement V9.1

Security Updates (1)

• 5123731

Acknowledgments

odgrso with <a href="https://gmo-cybersecurity.com/">GMO CyberSecurity by Ierae</a>

Revision History

• 2026-09-08: Information published.