CVE-2025-53765 is a vulnerability classified under CWE-359 (Exposure of Private Personal Information to an Unauthorized Actor) affecting Microsoft Azure Stack Hub version 1.0.0. This vulnerability allows an attacker who already has authorized high-level privileges on the local system to disclose private personal information that should otherwise be protected. The vulnerability does not require user interaction and does not impact system integrity or availability, but it compromises confidentiality by exposing sensitive data locally. The CVSS 3.1 base score is 4.4, reflecting a medium severity due to the requirement for local access and high privileges (AV:L/PR:H). The vulnerability was published on August 12, 2025, with no known exploits in the wild to date. The exposure likely arises from insufficient access controls or improper data handling within Azure Stack Hub’s local environment, allowing privileged users to access data beyond their intended scope. Since Azure Stack Hub is a hybrid cloud platform designed to extend Azure services on-premises, this vulnerability could expose sensitive personal data managed within these environments. The lack of a patch link indicates that a fix may still be pending or in development. Organizations relying on Azure Stack Hub 1.0.0 should be aware of this issue and prepare to implement mitigations once patches are released.

For European organizations, the primary impact of CVE-2025-53765 is the potential unauthorized disclosure of private personal information, which could lead to violations of GDPR and other data protection regulations. The confidentiality breach could damage organizational reputation, result in regulatory fines, and erode customer trust. Since exploitation requires local access with high privileges, the threat is more relevant to insider threats or attackers who have already compromised administrative accounts. Organizations with sensitive data hosted on Azure Stack Hub, such as healthcare, finance, and government entities, face higher risks. The vulnerability does not affect system integrity or availability, so operational disruption is unlikely. However, the exposure of personal data could have cascading effects, including targeted phishing or social engineering attacks. European entities must consider this vulnerability in their risk assessments, especially where Azure Stack Hub is deployed in hybrid cloud scenarios involving sensitive personal data.

1. Restrict and monitor administrative and high-privilege access to Azure Stack Hub environments to minimize the risk of insider threats or privilege escalation. 2. Implement strict role-based access controls (RBAC) and regularly audit permissions to ensure least privilege principles are enforced. 3. Monitor local system access logs and unusual activities that could indicate attempts to exploit this vulnerability. 4. Prepare to deploy official patches from Microsoft as soon as they become available; subscribe to Microsoft security advisories for updates. 5. Employ data encryption at rest and in use within Azure Stack Hub to reduce the impact of data exposure. 6. Conduct regular security awareness training for administrators to recognize and prevent misuse of privileged access. 7. Consider network segmentation and isolation of Azure Stack Hub components to limit local access vectors. 8. Review and enhance endpoint security controls on systems hosting Azure Stack Hub to detect and prevent unauthorized local access.