Authenticated code execution via unsafe deserialization
Published Aug 11, 2026 · Updated Aug 25, 2026
Deserialization of untrusted data in Microsoft Dynamics 365 (on-premises) before 9.1.0047.0006 allows remote authenticated users to execute code. Microsoft has disclosed only that server-side processing deserializes attacker-controlled data unsafely and has not publicly identified the vulnerable endpoint, handler, or object type. Exploitation requires valid low-privilege application access over the network and can yield code execution in the Dynamics 365 server context, with resulting compromise of application data and service availability.
Summary
What happened
Deserialization of untrusted data in Microsoft Dynamics 365 (on-premises) before 9.1.0047.0006 allows remote authenticated users to execute code. Microsoft has disclosed only that server-side processing deserializes attacker-controlled data unsafely and has not publicly identified the vulnerable endpoint, handler, or object type. Exploitation requires valid low-privilege application access over the network and can yield code execution in the Dynamics 365 server context, with resulting compromise of application data and service availability.
The record
- CVE
- CVE-2026-65815
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-502
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo