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Privacy Statement Third-Party Cookies Accept Reject Manage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-42833 Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability New On this page  CVE-2026-42833  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: May 12, 2026 Assigning CNA Microsoft CVE.org link CVE-2026-42833  Impact Remote Code Execution Max Severity Important Weakness CWE-250: Execution with Unnecessary Privileges CVSS Source Microsoft Vector String CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C Metrics CVSS:3.1 9.1 / 7.9  Base score metrics: 9.1 / Temporal score metrics: 7.9  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Network Attack Complexity Low Privileges Required High User Interaction None Scope Changed Confidentiality High Integrity High Availability High   Temporal score metrics(3) Exploit Code Maturity Unproven Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Executive Summary Execution with unnecessary privileges in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to execute code over a network. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Publicly disclosed No Exploited No Exploitability assessment Exploitation Less Likely FAQ **According to the CVSS metric, privileges required is high (PR:H). What does that mean for this vulnerability? ** Successful exploitation of this vulnerability requires an attacker to already have a high level of access, specifically a System Administrator role in Microsoft Dynamics 365 CRM. As a result, this issue cannot be exploited by an unauthenticated or low-privilege user and would only be relevant to users who already have elevated permissions. How could an attacker exploit this vulnerability? An attacker with System Administrator privileges could modify specific data associated with background operations through the CRM web interface. When the system later processes this data, it may be deserialized without proper validation, allowing the attacker to trigger unauthorized commands on the CRM server. According to the CVSS metric, successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability? This vulnerability could lead to the attacker gaining the ability to interact with other tenant’s applications and content. Acknowledgements Kentaro Kawane with GMO Cybersecurity by Ierae, Inc. https://gmo-cybersecurity.com/ f7d8c52bec79e42795cf15888b85cbad  TALHA GÜNAY nxhoang99 𝕏 @ hoangnx99 and hoangha with VCSLab of Viettel Cyber Security hoang.ha.handle@gmail.com Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Customer Action Required Title: Release date, Content: May 12, 2026 Microsoft Dynamics 365 (on-premises) version 9.1 - Remote Code Execution Important Title: Knowledge Base Articles for Microsoft Dynamics 365 (on-premises) version 9.1, Content:, 1 link 5078943  Title: Download Security Update for Microsoft Dynamics 365 (on-premises) version 9.1, Content:, 1 link Security Update  Title: Build numbers, Content: 9.1.44.15 Title: Assigning CNA, Content: Microsoft Title: Customer action required, Content: Required All results loaded Loaded all 1 rows Disclaimer The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. Revisions version revisionDate description 1.0 May 12, 2026 Information published.  How satisfied are you with the MSRC Security Update Guide? Rating  Broken  Bad  Below average  Average  Great!  Your Privacy Choices Consumer Health Privacy