CVE-2025-29807 is a deserialization vulnerability classified under CWE-502 affecting Microsoft Dataverse, a core component of Microsoft's Power Platform used for data storage and business application development. The vulnerability arises from improper handling of untrusted serialized data, which when deserialized, can lead to arbitrary code execution. An attacker with authorized network access and limited privileges can exploit this flaw by sending crafted serialized objects that the Dataverse service processes insecurely. The vulnerability requires user interaction, possibly in the form of triggering a deserialization process through legitimate application workflows. The CVSS 3.1 score of 8.7 reflects the high impact on confidentiality and integrity, with no direct availability impact. The scope is changed (S:C), indicating that exploitation can affect resources beyond the initially compromised component. No patches or known exploits are currently available, but the vulnerability is publicly disclosed and enriched by CISA, highlighting its significance. This vulnerability could enable attackers to execute arbitrary code remotely, potentially leading to data breaches, unauthorized data manipulation, or lateral movement within enterprise environments leveraging Dataverse.

For European organizations, this vulnerability poses a significant risk due to the widespread adoption of Microsoft Dataverse in business-critical applications, especially within the Microsoft Power Platform ecosystem. Exploitation could lead to unauthorized access to sensitive data, manipulation of business logic, and potential compromise of integrated systems. Confidentiality and integrity breaches could result in data leaks, regulatory non-compliance (e.g., GDPR violations), and operational disruptions. The lack of availability impact reduces the risk of denial-of-service but does not diminish the severity of data compromise. Organizations in sectors such as finance, healthcare, and government, which heavily rely on Microsoft cloud services, may face heightened risks. The requirement for user interaction and authorized access somewhat limits the attack surface but does not eliminate the threat, especially in environments with insufficient privilege separation or weak access controls.

1. Immediately review and restrict user privileges to the minimum necessary, especially for users who can trigger deserialization processes within Dataverse. 2. Implement strict network segmentation to limit access to Dataverse services only to trusted and authenticated users and systems. 3. Monitor logs and telemetry for unusual deserialization activity or anomalous behavior indicative of exploitation attempts. 4. Employ application-layer filtering or web application firewalls (WAFs) capable of detecting and blocking malicious serialized payloads. 5. Educate users and administrators about the risks of interacting with untrusted data and enforce policies to avoid unsafe data inputs. 6. Prepare for patch deployment by closely following Microsoft advisories and testing updates in controlled environments before production rollout. 7. Conduct regular security assessments and penetration testing focused on deserialization vulnerabilities within custom Dataverse applications or integrations. 8. Use endpoint detection and response (EDR) solutions to detect and respond to suspicious code execution patterns that may arise from exploitation.