EUVD-2026-73738
GHSA-2vrx-2v3j-84hp
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-accessible .NET deserialization RCE; PR:L because a valid Dynamics 365 user account is required; full CIA impact reflects arbitrary code execution on the application server.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Deserialization of untrusted data in Microsoft Dynamics 365 allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Dynamics 365 on-premises version 9.1 (prior to build 9.1.0046.0006) is achievable by an authenticated low-privileged attacker via deserialization of untrusted data over the network. The CWE-502 flaw allows crafted serialized objects to be processed without adequate validation, yielding full confidentiality, integrity, and availability compromise of the affected server. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated account with low privileges on the target Microsoft Dynamics 365 on-premises 9.1 installation running a build prior to 9.1.0046.0006. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score reflects network-accessible exploitation (AV:N), low complexity (AC:L), low-privilege authentication (PR:L), no user interaction (UI:N), and full CIA triad impact - a high-severity combination. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patch upgrading Microsoft Dynamics 365 on-premises to build 9.1.0046.0006 or later, per the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65772. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Dynamics 365 on-premises 9.1 deployments and identify instances running builds prior to 9.1.0046.0006; immediately enforce network segmentation and monitor for suspicious authentication activity from low-privileged accounts. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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