Vulnerability · Published Aug 11, 2026 · Assigned by microsoft
CVE-2026-65815Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
High 8.8
In plain English
A high-severity unsafe deserialization in Microsoft Dynamics 365 (on-premises) version 9.1 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 77% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)1.7%top 22.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Deserialization of untrusted data in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to execute code over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Dynamics 365 (on-premises) version 9.1 | 9.0 – before 9.1.0047.0006 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability vendor-advisory, patch