What is CVE-2026-66301?

CVE-2026-66301 is a medium-severity vulnerability in Microsoft Dynamics 365 (On-premises) Version 9.1, classified under Information Disclosure. CVSS score: 6.5/10. Published 2026-08-11.

How severe is CVE-2026-66301?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Information disclosure in Microsoft Dynamics 365 (On-premises) Version 9.1

CVE-2026-66301

Exposure of sensitive information to an unauthorized actor in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to disclose information over a network.

Vulnerability class: Information Disclosure

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

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

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-66301?: CVE-2026-66301 is a medium-severity vulnerability in Microsoft Dynamics 365 (On-premises) Version 9.1, classified under Information Disclosure. CVSS score: 6.5/10. Published 2026-08-11.
How severe is CVE-2026-66301?: Medium severity. CVSS v3 base score is 6.5 out of 10.