Quick answers
- Is CVE-2026-65815 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-65815 being exploited in the wild.
- How severe is CVE-2026-65815?
- High severity, with a CVSS score of 8.8, published 11 August 2026.
- Which products and versions are affected?
- Microsoft Dynamics 365 on-premises (specific versions not disclosed in advisory).
- Is there a fix for CVE-2026-65815?
- 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-2026-65815 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-65815?
- 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
The vulnerability is a deserialization of untrusted data flaw in Microsoft Dynamics 365 on-premises. An authorized attacker can send specially crafted network traffic to trigger unsafe deserialization, leading to remote code execution. While authentication is required, the network-reachable attack vector means any authorized user with network access can exploit this. Patches are expected to be available through Microsoft's security updates.
Affected products
- Microsoft Dynamics 365 on-premises (specific versions not disclosed in advisory)
Timeline
- 2026-08-11: disclosed: CVE-2026-65815 published