CVE-2026-77908

Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability

CVE-2026-77908 is fixed in Microsoft Dynamics 365 Customer Engagement V9.1 on 1 platform by KB5123731 (version ), released September 8, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.8

Important

Exploitation

None reported

N/A

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0099

62nd percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Microsoft Dynamics 365 Customer Engagement V9.1		KB5123731	Sep 8, 2026

Details

Published
September 8, 2026
Weakness
Improper Control of Generation of Code ('Code Injection')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77908

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