What is CVE-2026-40371?

CVE-2026-40371 is a high-severity vulnerability in Microsoft Dynamics 365, classified under Improper Handling of Insufficient Permissions or Privileges. CVSS score: 8.8/10. Published 2026-06-09.

How severe is CVE-2026-40371?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Microsoft Dynamics 365

CVE-2026-40371

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

Published 2026-06-09 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (54.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.001

Affected products

Microsoft Dynamics 365
Microsoft Dynamics 365 (On-Premises) Version 9.1 — versions 9.0

Weakness classification (CWE)

References

Microsoft Dynamics 365 (on-premises) Elevation of Privilege Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40371?: CVE-2026-40371 is a high-severity vulnerability in Microsoft Dynamics 365, classified under Improper Handling of Insufficient Permissions or Privileges. CVSS score: 8.8/10. Published 2026-06-09.
How severe is CVE-2026-40371?: High severity. CVSS v3 base score is 8.8 out of 10.