CVE-2026-77908: Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability

Severity: high (CVSS 8.8 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: 2026-09-08 · updated 2026-10-31
Weakness: CWE-94

Description

Improper control of generation of code ('code injection') in Microsoft Dynamics 365 allows an authorized attacker to execute code over a network.

Affected products

Microsoft Dynamics 365 (on-premises) version 9.0: before 9.1.0048.0004 — fixed in 9.1.0048.0004
Microsoft Dynamics 365 (on-premises) version 9.0: from 9.0 before 9.1.0048.0004 — fixed in 9.1.0048.0004

How to fix

Upgrade to a fixed version: Microsoft Dynamics 365 (on-premises) version 9.0 9.1.0048.0004; Microsoft Dynamics 365 (on-premises) version 9.0 9.1.0048.0004. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77908

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