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.

EPSS: 0.006 (46.5th percentile) — read the EPSS interpretation.

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.

Affected products

Microsoft Dynamics_365
Microsoft Dynamics 365 (On-premises) Version 9.1 — versions 9.0

Weakness classification (CWE)

CWE-280 — Improper Handling of Insufficient Permissions or Privileges
CWE-755 — Improper Handling of Exceptional Conditions

References

secure@microsoft.com (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.