CVE-2026-40371: Microsoft Dynamics 365 (on-premises) Elevation of Privilege 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
Elevation of Privilege
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2026-Jun
Released
2026-06-09

Description

Improper handling of insufficient permissions or privileges in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to elevate privileges over a network.

FAQ

How could an attacker exploit this vulnerability? An attacker who is already signed in to the affected Microsoft Dynamics 365 (On‑Premises) system could send a specially crafted request to the vulnerable scenario‑switching page, which does not properly check permissions. By doing so, the attacker could improperly assign themselves the System Administrator role and gain full administrative control of the organization. What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who successfully exploited this vulnerability could gain administrator privileges.

Affected Products (1)

Microsoft Dynamics

  • Microsoft Dynamics 365 (on-premises) version 9.1

Security Updates (1)

Acknowledgments

Kentaro Kawane with <a href="https://gmo-cybersecurity.com/">GMO Cybersecurity by Ierae, Inc.</a>, f7d8c52bec79e42795cf15888b85cbad

Revision History

  • 2026-06-09: Information published.