CVE-2026-65772: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft Dynamics 365 (on-premises) version 9.1
Description
CVE-2026-65772 is a high-severity vulnerability in Microsoft Dynamics 365 (on-premises) version 9.1 involving deserialization of untrusted data. This flaw allows an authorized attacker to execute code remotely over a network. The vulnerability affects versions from 9.0 up to but not including 9.1.0046.0006. An official fix is available from Microsoft. No known exploits are reported in the wild at this time.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft Dynamics 365 (on-premises) version 9.1
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-502) in Microsoft Dynamics 365 (on-premises) version 9.1 arises from improper handling of untrusted data during deserialization. An authorized attacker can leverage this flaw to execute arbitrary code remotely over the network. The CVSS 3.1 score is 8.8, indicating high impact on confidentiality, integrity, and availability. The affected versions are >=9.0 and <9.1.0046.0006. Microsoft has released an official fix, and the product is a cloud service with vendor-managed remediation.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely, potentially leading to full compromise of the affected system, impacting confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the patch for Microsoft Dynamics 365 (on-premises) version 9.1 as provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65772. Since this is a cloud service, Microsoft manages remediation for hosted environments. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-22T21:30:09.118Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65772","vendor":"Microsoft"}]
Threat ID: 6aa044c7acd9273b49fa7b01
Added to database: 09/08/2026, 17:24:23 UTC
Last enriched: 10/16/2026, 20:40:01 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 39
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