CVE-2025-21076 is a vulnerability classified under CWE-280, indicating improper handling of insufficient permissions or privileges in the Samsung Account application on Samsung mobile devices. This vulnerability exists in versions prior to 15.5.00.18 and allows a local attacker to access data stored within the Samsung Account without requiring any prior privileges or authentication. The attack vector is local (AV:L), meaning the attacker must have physical or logical local access to the device. User interaction (UI:R) is required to trigger the vulnerability, which could involve convincing the user to perform an action that enables the exploit. The vulnerability impacts confidentiality (C:H) by exposing sensitive data but does not affect integrity (I:N) or availability (A:N). The CVSS v3.1 base score is 5.5, reflecting a medium severity level. No known exploits are currently reported in the wild, and no patches or updates are linked yet, indicating that remediation may be pending or in development. The flaw arises from the application failing to properly check or enforce permission levels before granting access to Samsung Account data, potentially allowing unauthorized local users to bypass intended access controls. This could lead to exposure of personal information, credentials, or other sensitive data stored in the Samsung Account, which is often used for device synchronization, backup, and authentication services on Samsung mobile devices.

For European organizations, this vulnerability poses a risk primarily to confidentiality of sensitive user data stored in Samsung Account on mobile devices. Organizations with employees using Samsung mobile devices for corporate communication or data synchronization could face data leakage risks if an attacker gains local access to these devices. This could lead to exposure of personal identifiable information (PII), corporate credentials, or other sensitive data, potentially facilitating further attacks such as identity theft or unauthorized access to corporate resources. Although the vulnerability does not impact data integrity or device availability, the confidentiality breach alone can have regulatory implications under GDPR and other data protection laws in Europe. The requirement for local access and user interaction limits the attack scope but does not eliminate risk, especially in environments where devices may be lost, stolen, or accessed by unauthorized personnel. The absence of known exploits reduces immediate threat but does not preclude future exploitation once details become widely known.

European organizations should prioritize updating Samsung Account to version 15.5.00.18 or later as soon as the patch is available to address this vulnerability. Until patches are deployed, organizations should enforce strict physical security controls to prevent unauthorized local access to mobile devices, including device lock policies, biometric authentication, and secure storage. User awareness training should emphasize the risks of social engineering or inadvertent user actions that could trigger the vulnerability. Mobile device management (MDM) solutions can be used to monitor and restrict installation of untrusted applications and enforce security policies. Additionally, organizations should audit and limit the use of Samsung Account features on corporate devices where feasible, or consider alternative secure authentication and synchronization methods. Regular security assessments and endpoint monitoring can help detect suspicious activity indicative of exploitation attempts. Finally, organizations should maintain up-to-date inventories of affected devices and ensure timely communication with users regarding security updates.