CVE-2026-58944 in Android
Summary
by MITRE • 11/02/2026
In moveTaskToFrontLocked of ActivityTaskManagerService.java, there is a possible background application launch (bal) issue due to a confused deputy. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified in the moveTaskToFrontLocked method within ActivityTaskManagerService.java represents a critical confusion of authority flaw that facilitates unauthorized background application launches, commonly referred to as BAL attacks. This issue stems from an improper enforcement of access controls where the system fails to adequately verify whether the requesting entity has legitimate authorization to manipulate task states for other applications. In Android architecture, ActivityTaskManagerService is responsible for managing the lifecycle and stacking of activities, making it a central point of control over application visibility and execution context. When this service processes requests to bring tasks to the front or modify their state without rigorous validation of the caller's identity relative to the target task owner, it creates an opportunity for privilege escalation. The core technical flaw lies in the logic that allows one process to influence the activity stack of another without sufficient checks on ownership permissions, effectively allowing a lower-privileged application to hijack system resources intended for higher-privilege or protected applications.
From a security taxonomy perspective, this vulnerability aligns with CWE-269, which describes Improper Privilege Management, specifically in contexts where an actor is able to perform actions beyond their assigned privileges due to flawed authorization logic. Furthermore, the exploitation technique maps directly to MITRE ATT&CK techniques related to Defense Evasion and Persistence, such as T1055 Process Injection or more broadly T1203 Exploitation for Client Execution, depending on how the background launch is leveraged. The confusion of deputy aspect indicates that a malicious application can impersonate a trusted system component or exploit trust relationships within the Android framework to execute code in a different security context than intended by the developer. This misconfiguration allows the attacker to bypass standard sandboxing mechanisms that are designed to isolate applications from one another, thereby compromising the integrity of the operating environment.
The operational impact of this vulnerability is significant as it enables local escalation of privilege without requiring user interaction or additional execution privileges on the part of the attacker. An adversary can exploit this flaw by crafting a specific intent or system call that triggers the moveTaskToFrontLocked function with malformed parameters, causing the Android framework to launch a target application in the background under elevated permissions. This capability allows for stealthy persistence mechanisms where malicious code runs silently without triggering user notifications typically associated with app launches. It also facilitates data exfiltration by enabling unauthorized access to sensitive information stored within or accessible by the targeted applications. Since no user interaction is required, automated malware can propagate and execute complex attack chains seamlessly in the background, significantly increasing the risk of compromise on affected devices.
Mitigation strategies must focus on strengthening authorization checks within the ActivityTaskManagerService codebase. Developers should implement strict validation to ensure that only processes with explicit ownership or system-level privileges can invoke methods that alter task states for other applications. This includes verifying package names and user IDs against established permission policies before allowing any state transitions. Additionally, enforcing least privilege principles by restricting access to critical service endpoints through signature-based permissions or runtime checks is essential. System administrators should ensure devices are updated with the latest security patches provided by device manufacturers, as these updates typically contain fixes for such framework-level vulnerabilities. Regular auditing of application behaviors and monitoring for anomalous background activity can also help detect exploitation attempts in real-time, providing an additional layer of defense against this type of privilege escalation attack.