# CVE-2026-66301: Microsoft Dynamics 365 sensitive information disclosure

Source: https://junglewise.ai/threats/cve-2026-66301-microsoft-dynamics-365-sensitive-information-disclosure  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-11. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-66301 · Severity: medium · CVSS 6.5 · Published 2026-08-11

Microsoft Dynamics 365 (on-premises) is an enterprise resource planning system that manages critical business data including customer information, financial records, and operational data. A vulnerability in this system allows an authorized user to disclose sensitive information over the network to unauthorized parties, potentially exposing confidential business and customer data.

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

## Quick answers

**Is CVE-2026-66301 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-66301 being exploited in the wild.

**How severe is CVE-2026-66301?** Medium severity, with a CVSS score of 6.5, published 11 August 2026.

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

**Is there a fix for CVE-2026-66301?** 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-2026-66301 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-66301?** Check whether you run 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

This vulnerability is an information disclosure flaw in Microsoft Dynamics 365 (on-premises) that allows an authenticated attacker with authorized access to extract sensitive data and transmit it over the network. The attack requires the attacker to already have valid credentials and authorized access to the system. By exploiting this vulnerability, an attacker can bypass data confidentiality protections and exfiltrate sensitive business information. A patch is expected to be available through Microsoft's standard security update process.

## Affected products

- Microsoft Dynamics 365 on-premises

## Timeline

- 2026-08-11: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66301](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66301)

## 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 deserialization of untrusted data](https://junglewise.ai/threats/cve-2026-65772-microsoft-dynamics-365-deserialization-of-untrusted-data)
- [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)