Quick answers
- Is CVE-2026-42833 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-42833 being exploited in the wild.
- How severe is CVE-2026-42833?
- Critical severity, with a CVSS score of 9.1, published 12 May 2026.
- Which products and versions are affected?
- Microsoft Dynamics 365 (on-premises) 9.1 up to (excluding) 9.1.45.11.
- Is there a fix for CVE-2026-42833?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-42833 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-42833?
- Check whether you run Microsoft Dynamics 365 (on-premises) or Microsoft Dynamics 365 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A code injection vulnerability exists in Microsoft Dynamics 365 (on-premises) due to improper control of code generation. An attacker with high-level administrative privileges (PR:H) can exploit this flaw over a network without any user interaction. Successful exploitation allows for arbitrary code execution with the potential to escape the application's security scope (Scope: Changed). The vulnerability is tracked as CWE-94 (Code Injection) and was previously associated with CWE-250 (Execution with Unnecessary Privileges). Microsoft has released security updates to address this issue in version 9.1.45.11 and later.
Affected products
- Microsoft Dynamics 365 (on-premises) 9.1 up to (excluding) 9.1.45.11
Timeline
- 2026-05-12: disclosed
- 2026-05-12: advisory: Initial advisory published by Microsoft
- 2026-06-01: other: Vulnerability description updated to specify code injection