CVE-2026-21108 in Bixby Touch
Summary
by MITRE • 09/09/2026
Improper export of android application components in Bixby Touch prior to version 4.3.01.17 allows local attackers to access sensitive information.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an improper export of Android application components within Samsung's Bixby Touch software, specifically affecting versions prior to 4.3.01.17, represents a significant security misconfiguration in the mobile operating system's component management architecture. In the Android ecosystem, application components such as activities, services, broadcast receivers, and content providers are defined by their export status within the app manifest file. When these components are incorrectly exported or left with overly permissive intent filters without adequate access controls, they become accessible to other applications installed on the same device. This flaw allows local attackers, who may be malicious third-party apps or compromised legitimate software, to interact directly with Bixby Touch internals that were intended for internal system use only. The core technical failure lies in the absence of proper permission checks and component visibility restrictions during the initialization and invocation phases of these exported interfaces.
From a technical perspective, this vulnerability falls under the category of improper access control mechanisms where the principle of least privilege is violated by exposing sensitive application logic to unauthorized contexts. Attackers can exploit this misconfiguration by crafting specific intents that target the exposed components of Bixby Touch. Since Bixby serves as a voice assistant and personal information manager, it often holds deep integration with user contacts, calendar data, location services, and potentially authentication tokens or session states required for seamless interaction with other Samsung ecosystem apps. By invoking these exported components without proper authorization, an attacker can bypass standard Android security boundaries that would normally isolate app sandboxes from one another. This enables the extraction of sensitive personal information stored within the Bixby database or accessed through its API endpoints, effectively breaking the isolation model that protects user privacy on mobile devices.
The operational impact of this vulnerability is severe due to the privileged nature of voice assistant applications which often maintain persistent background processes and high-level system permissions. Local attackers can leverage this flaw to perform unauthorized data exfiltration, potentially harvesting contact lists, private messages linked through integrations, location history, or other personally identifiable information that Bixby aggregates for its features. Furthermore, depending on the specific implementation details of the exported components, there may be risks associated with remote code execution if certain intent parameters are not sanitized properly before being processed by the underlying native libraries. Even without direct code execution, the ability to read sensitive data from a trusted system component undermines user trust and compromises confidentiality guarantees expected in modern mobile operating systems. This type of vulnerability is particularly dangerous because it does not require physical access or complex exploit chains; any app with standard installation privileges can attempt exploitation, making it scalable across millions of devices running affected versions.
To mitigate this risk, users must immediately update their Bixby Touch application to version 4.3.01.17 or later where the vendor has corrected the component export settings and enforced stricter access controls. Developers should review Android documentation regarding secure app component design, ensuring that all activities, services, receivers, and providers are explicitly marked as not exported unless absolutely necessary for inter-app communication. When exporting is required, strict permission enforcement using android:permission attributes must be implemented to restrict invocation to only trusted system apps or those with specific signature-level permissions. Security auditors should also employ static analysis tools configured to detect improper export configurations in AndroidManifest.xml files and dynamic testing frameworks that attempt intent-based interactions with exposed components to verify access restrictions are functioning as intended. This aligns with industry standards such as CWE-269 which addresses Improper Privilege Management, ensuring that application components do not operate with elevated privileges or visibility beyond their required scope.
In the context of broader threat modeling and adversary behavior frameworks like MITRE ATT&CK for Mobile, this vulnerability facilitates techniques related to Collection via Screen Capture or Data from Information Repositories if the attacker can programmatically access stored data through exposed APIs. It also relates to Defense Evasion by allowing malicious actors to operate within trusted system processes without triggering standard security alerts associated with unauthorized app behavior. Organizations deploying Samsung devices in enterprise environments should enforce mobile device management policies that mandate timely patching of core system applications like Bixby Touch, as these components often serve as high-value targets for data theft campaigns targeting executive or sensitive personnel information. Regular auditing of installed application permissions and monitoring for unusual background activity from voice assistant services can provide additional layers of defense against exploitation attempts while waiting for official patches to be distributed through standard update channels.