# CVE-2026-65772: Microsoft Dynamics 365 deserialization of untrusted data

Source: https://junglewise.ai/threats/cve-2026-65772-microsoft-dynamics-365-deserialization-of-untrusted-data  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-65772 · Severity: high · CVSS 8.8 · Published 2026-09-08

Microsoft Dynamics 365 is an enterprise resource planning and customer relationship management platform used by organizations to manage business operations and customer interactions. A deserialization vulnerability allows an authorized network user to execute arbitrary code on systems running the affected product, potentially leading to complete system compromise, data theft, and operational disruption.

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

## Quick answers

**Is CVE-2026-65772 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-65772 being exploited in the wild.

**How severe is CVE-2026-65772?** High severity, with a CVSS score of 8.8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Dynamics 365.

**Is there a fix for CVE-2026-65772?** 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-2026-65772 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-65772?** Check whether you run Microsoft Dynamics 365. 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

The vulnerability stems from unsafe deserialization of untrusted data in Microsoft Dynamics 365. An authenticated attacker with network access can craft malicious serialized objects that, when deserialized by the application, trigger remote code execution. The attack requires valid credentials (authorization), but once authenticated, the attacker gains the ability to execute arbitrary code with the privileges of the Dynamics 365 service. No user interaction or additional exploitation steps are needed beyond sending the malicious payload over the network. Microsoft has addressed this issue with security updates.

## Affected products

- Microsoft Dynamics 365

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65772](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65772)

## Related threats

- [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 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)
- [Microsoft Dynamics 365 privilege escalation via improper access control](https://junglewise.ai/threats/cve-2026-47647-microsoft-dynamics-365-privilege-escalation-via-improper-access)
- [Microsoft Dynamics 365 code injection](https://junglewise.ai/threats/cve-2026-42833-microsoft-dynamics-365-code-injection)