CVE-2026-66301: Microsoft Dynamics 365 (On-Premises) Information Disclosure Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-11 · updated 2026-10-30
Weakness: CWE-200

Description

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

Affected products

Microsoft Dynamics 365 (on-premises) version 9.0: from 9.1 before 9.1.47.06 — fixed in 9.1.47.06
Microsoft Dynamics 365 (on-premises) version 9.0: from 9.0 before 9.1.0047.0006 — fixed in 9.1.0047.0006

How to fix

Upgrade to a fixed version: Microsoft Dynamics 365 (on-premises) version 9.0 9.1.47.06; Microsoft Dynamics 365 (on-premises) version 9.0 9.1.0047.0006. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66301

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