CVE-2025-54781 is a vulnerability identified in the himmelblau interoperability suite, specifically versions 1.0.0 up to but not including 1.1.0. Himmelblau is designed to facilitate integration between Microsoft Azure Entra ID and Intune, two critical components in enterprise identity and device management. The vulnerability arises when debugging is enabled in the himmelblaud_tasks service, which inadvertently logs an Intune service access token to the system journal. This token is short-lived but sensitive, as it can reveal the host's Intune compliance status. Furthermore, possession of this token may allow an attacker to perform additional administrative operations on the Intune-managed host device, although the APIs for these operations are undocumented and thus not fully understood. The vulnerability is categorized under CWE-532, which involves the insertion of sensitive information into log files, potentially exposing secrets to unauthorized users. The CVSS 3.1 base score is 2.8, indicating a low severity primarily because exploitation requires local access (AV:L), low attack complexity (AC:L), high privileges (PR:H), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. No known exploits are currently reported in the wild. The issue is resolved in version 1.1.0 by disabling the logging of sensitive tokens during debugging. The recommended immediate mitigation is to disable debugging in affected versions to prevent token leakage.

For European organizations, the impact of this vulnerability is primarily related to confidentiality breaches of sensitive tokens used in device compliance and management. If an attacker gains local access to a system running an affected version of himmelblau with debugging enabled, they could extract Intune service tokens from logs. This could allow them to infer device compliance status and potentially execute administrative operations on the device within Intune's management scope. Although the APIs for these operations are undocumented, the risk exists that attackers could manipulate device configurations or bypass compliance policies, undermining endpoint security. This could lead to unauthorized access to corporate resources, data leakage, or disruption of device management workflows. Given that Intune and Azure Entra ID are widely used in European enterprises for identity and device management, especially in regulated sectors like finance, healthcare, and government, the confidentiality compromise could have compliance and operational repercussions. However, the requirement for high privileges and user interaction limits the likelihood of remote exploitation, reducing the overall risk. Organizations with strict auditing and monitoring may detect such token exposures, but those lacking robust local access controls could be more vulnerable.

European organizations should immediately verify the version of himmelblau deployed in their environments and ensure it is upgraded to version 1.1.0 or later where this vulnerability is fixed. If upgrading is not immediately feasible, debugging must be disabled on all himmelblau instances to prevent token leakage. Additionally, organizations should audit system journals and logs for any exposure of Intune service tokens and rotate any potentially compromised tokens to invalidate them. Implement strict local access controls and monitoring on systems running himmelblau to prevent unauthorized users from accessing logs or enabling debugging. Employ role-based access control (RBAC) to limit who can enable debugging or access sensitive logs. Regularly review and harden logging configurations to avoid sensitive data exposure. Finally, integrate endpoint detection and response (EDR) solutions to monitor for unusual administrative operations on Intune-managed devices that could indicate exploitation attempts.