# CVE-2026-33103: Microsoft Dynamics 365 improper access control in on-premises version

Source: https://junglewise.ai/threats/cve-2026-33103-microsoft-dynamics-365-improper-access-control-in-on-premises  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-14. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2026-33103 · Severity: medium · CVSS 5.5 · Published 2026-04-14

Microsoft Dynamics 365 (on-premises) is a business application platform used for managing customer relationships and enterprise resources. A security flaw in the on-premises version allows an authorized user on the local system to bypass access controls and view sensitive information they should not be able to see. This could lead to the unauthorized disclosure of internal business data or customer records.

Technologies: [Microsoft Dynamics 365 (on-premises)](https://junglewise.ai/threats/technologies/dynamics-365-on-premises), [Microsoft Dynamics 365](https://junglewise.ai/threats/technologies/dynamics-365). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-33103 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33103 being exploited in the wild.

**How severe is CVE-2026-33103?** Medium severity, with a CVSS score of 5.5, published 14 April 2026.

**Which products and versions are affected?** Microsoft Dynamics 365 (on-premises) 9.0.0 to 9.1.0044.0015.

**Is there a fix for CVE-2026-33103?** 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-2026-33103 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-33103?** 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

An improper access control vulnerability (CWE-284) exists in Microsoft Dynamics 365 (on-premises) version 9.0. The flaw allows an authenticated attacker with local access to the system to bypass security restrictions and gain unauthorized access to sensitive information. The attack vector is local, meaning the attacker must already have credentials and access to the environment where the software is running. Successful exploitation results in a high impact on confidentiality but does not affect system integrity or availability. Microsoft has released updates to address this issue in version 9.1.44.15 and later.

## Affected products

- Microsoft Dynamics 365 (on-premises) version 9.0 9.0.0 to 9.1.0044.0015

## Timeline

- 2026-04-14: disclosed
- 2026-04-14: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33103](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33103)

## Related threats

- [Microsoft Dynamics 365 XML external entity injection](https://junglewise.ai/threats/cve-2026-122196-improper-restriction-of-xml-external-entity-reference-in)
- [Microsoft Dynamics 365 code injection in code generation](https://junglewise.ai/threats/cve-2026-77908-microsoft-dynamics-365-code-injection-in-code-generation)
- [Microsoft Dynamics 365 deserialization of untrusted data](https://junglewise.ai/threats/cve-2026-65772-microsoft-dynamics-365-deserialization-of-untrusted-data)
- [Microsoft Dynamics 365 sensitive information disclosure](https://junglewise.ai/threats/cve-2026-66301-microsoft-dynamics-365-sensitive-information-disclosure)
- [Microsoft Dynamics 365 deserialization of untrusted data in on-premises](https://junglewise.ai/threats/cve-2026-65815-microsoft-dynamics-365-deserialization-of-untrusted-data-in-on)