CVE-2026-21055 in Bixby
Summary
by MITRE • 07/10/2026
Improper export of android application components in Bixby prior to version 4.0.70.8 allows local attackers to execute arbitrary commands with Bixby privilege.
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Analysis
by VulDB Data Team • 07/10/2026
The vulnerability in question represents a critical security flaw within the Bixby assistant framework affecting versions prior to 4.0.70.8 on Android devices. This issue stems from improper export of application components, which creates an avenue for local attackers to escalate privileges and execute arbitrary commands with elevated Bixby privileges. The flaw essentially allows unauthorized code execution within the context of the Bixby service, potentially compromising the entire device security posture.
From a technical perspective, this vulnerability manifests as an insecure component exposure where Android application components such as services, activities, or broadcast receivers are improperly exported in the AndroidManifest.xml file. These components should typically be restricted to internal application access only but are instead made available for external invocation without proper authentication or authorization checks. The improper export creates a privilege escalation vector that enables local attackers to leverage these exposed components to gain elevated system privileges.
The operational impact of this vulnerability extends beyond simple command execution capabilities, as it allows attackers to manipulate the Bixby assistant functionality at a deep system level. Attackers can potentially access sensitive device data, modify system configurations, or even establish persistent backdoors through the compromised Bixby service. This represents a significant risk for enterprise environments where Bixby might be used for automated tasks or integration with corporate systems, as it could enable unauthorized access to business-critical information and processes.
The vulnerability aligns with CWE-922, which addresses insecure export of Android components, and specifically maps to ATT&CK technique T1068, involving the exploitation of legitimate credentials for privilege escalation. The flaw demonstrates poor security practices in component declaration and access control implementation within the Android application framework. Security controls typically implemented by the Android platform rely on proper manifest declarations and permission models to enforce component isolation, but this vulnerability bypasses these protections through improper configuration.
Organizations should immediately implement mitigations including updating to Bixby version 4.0.70.8 or later, where the export restrictions have been properly enforced. System administrators should also conduct comprehensive security audits of all Android applications that utilize component exports, particularly those with elevated privileges. Additional protective measures include implementing mobile device management solutions that can monitor for unauthorized component access patterns and establishing network segmentation to limit potential lateral movement if exploitation occurs. The vulnerability highlights the critical importance of proper Android security configuration and the need for regular security assessments of application component exposure.