Microsoft Dataverse Deserialization Flaw Enables Remote Code Execution

Deserialization of untrusted data in Microsoft Dataverse allows an unauthorized attacker to execute code over a network.

• Microsoft Dataverse: the product record marks the affected version as -, meaning that no specific version or release branch is stated.
• No exact version boundary, parallel branch, or fixed release is provided in the affected-product data.
• Do not infer that versions or branches outside the stated scope are unaffected.

This is a CWE-502: Deserialization of Untrusted Data flaw in Microsoft Dataverse. A component that processes serialized data can accept attacker-controlled or insufficiently validated input. The record describes network reachability, no required prior privileges, no user interaction, and low attack complexity. If malicious data processing reaches code execution, the attacker could act within the permissions of the affected execution context. The available evidence does not identify the endpoint, data format, internal component, or execution context involved.

• Reachability is described as network-based.
• The attack is characterized as requiring no prior authentication or privileges, no user interaction, and low complexity.
• The supplied record marks public_exploit as false and provides no public exploit steps.
• Available enrichment records exploitation as none at the time of its recorded assessment. This status is time-bounded and does not prove that exploitation has never occurred or will not occur.
• No specific campaign, victim, payload, or intrusion indicator is confirmed.

• The technical outcome is remote code execution in Microsoft Dataverse.
• The recorded impact characteristics are high for confidentiality, integrity, and availability.
• An attacker could affect data or service operations within the permissions of the compromised execution context. The exact post-exploitation privileges are not established.
• The record does not describe a change of scope into another system or component and provides no additional limiting condition beyond network reachability.

• Successful exploitation could allow code execution in the affected Microsoft Dataverse service context.
• Possible consequences include access to or modification of data available to that execution context, as well as service disruption. The specific accessible resources are not documented.
• Because the attack is described as network-reachable and does not require prior privileges or user interaction, exploitation may not depend on an end-user action.
• The record does not establish a specific breach, data loss, victim, or campaign.

1. Apply Microsoft's security update for Microsoft Dataverse and verify the remediation state for each relevant tenant or environment. The record indicates that a patch is available, but it does not provide an exact fixed release.
2. Do not treat any particular version as safe unless Microsoft confirms the applicable fixed boundary or remediation state.
3. If update status cannot be verified, use deployment-appropriate temporary controls such as restricting unnecessary access and reviewing integrations that can introduce untrusted data into Dataverse. No product-specific workaround is documented in the available evidence.
4. If exploitation is suspected, preserve relevant telemetry, investigate unusual data or administrative changes, and follow incident-response procedures.

1. Inventory tenants, environments, and integrations using Microsoft Dataverse, because the record does not provide a precise release boundary for direct filtering.
2. Check the Microsoft-provided update or remediation status for each Dataverse environment and retain evidence that the required state has been applied.
3. Review network and service telemetry for unusual requests, administrative changes, or abnormal data access involving Dataverse. Treat this as precautionary monitoring, not as a CVE-specific indicator.
4. Correlate anomalous activity with update deployment times and investigate signs of code execution or unauthorized changes.
5. No product-specific log signature, endpoint, or IOC is provided in the available evidence. The absence of suspicious events does not prove that an environment is safe.