Quick answers
- Is CVE-2026-40371 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-40371 being exploited in the wild.
- How severe is CVE-2026-40371?
- High severity, with a CVSS score of 8.8, published 9 June 2026.
- Which products and versions are affected?
- Microsoft Dynamics 365 (on-premises).
- Is there a fix for CVE-2026-40371?
- 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-2026-40371 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-40371?
- Check whether you run Microsoft Dynamics 365 (on-premises). 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 privilege escalation vulnerability exists in Microsoft Dynamics 365 (on-premises) categorized as CWE-280 (Improper Handling of Insufficient Permissions or Privileges). The flaw allows an authenticated attacker with low-privileged access to bypass intended permission checks over a network connection. Successful exploitation enables the attacker to gain high-level privileges (equivalent to administrative access), granting them full confidentiality, integrity, and availability impact over the affected environment. Microsoft has released security updates to address this issue; users should refer to the MSRC update guide for specific patching instructions.
Affected products
- Microsoft Dynamics 365 (on-premises)
Timeline
- 2026-06-09: disclosed
- 2026-06-09: advisory