CVE-2026-58886 in Android
Summary
by MITRE • 11/02/2026
In updateInputWindows of InputMonitor.java, there is a possible tapjacking issue due to a logic error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified within the inputUpdateWindows method of the InputMonitor class represents a critical security flaw rooted in improper access control and window management logic. As a cyber security specialist, it is evident that this issue stems from a failure to properly validate or restrict which application contexts are permitted to overlay or intercept user interface elements intended for privileged system processes. In Android architecture, the InputManagerService acts as the central hub for all input events, including touch gestures and key presses. When an application manipulates window layers without adequate permission checks, it can create a deceptive environment where malicious overlays mimic legitimate system dialogs or buttons. This specific logic error allows an attacker to position a transparent or visually identical view over sensitive UI components, effectively capturing user interactions before they reach the intended target application.
This type of flaw is classically categorized under CWE-201: Insertion of Sensitive Information into Sent Data when considering the interception aspect, but more accurately aligns with CWE-839: A Race Condition that Leads to a Security Bypass if the issue involves timing windows during window updates. However, in the context of tapjacking and UI redressing, it is most directly associated with CWE-1021: Improper Restriction of Rendered UI Layers or Frames. The core technical failure lies in the inability of the system to distinguish between legitimate system-level overlays and unauthorized application-layer views during the input dispatch phase. By exploiting this gap, an attacker can trick a user into interacting with a malicious interface while believing they are engaging with a secure system component, such as a password entry field or permission grant dialog.
The operational impact of this vulnerability is severe, particularly regarding local privilege escalation and data confidentiality. Although exploitation requires user interaction, the social engineering aspect is minimal because the attack relies on visual deception rather than complex manipulation. Once triggered, an attacker can capture sensitive input data, such as PINs, passwords, or one-time authentication codes, leading to account compromise. Furthermore, if the overlaid interface mimics a system permission request, it could trick users into granting elevated privileges to malicious applications, thereby achieving local privilege escalation without requiring any additional execution privileges like root access or exploit code injection. This bypasses traditional security boundaries that rely on user consent and proper UI representation.
From an offensive security perspective, this vulnerability maps directly to the MITRE ATT&CK technique T1053: Scheduled Task/Job with a known mechanism for persistence or interaction, specifically in the context of input capture via UI redressing (T1621). It also relates to T1408: Resource Hijacking if used to disrupt service availability through deceptive overlays. The lack of execution privileges needed makes this particularly dangerous as it lowers the barrier to entry significantly, allowing even low-privilege applications or compromised apps with minimal permissions to execute effective attacks against higher-privileged system services.
Mitigation strategies must focus on enforcing strict window layering policies and enhancing input event validation within the InputManagerService. Developers should ensure that only privileged system components are allowed to create overlays over sensitive UI elements, utilizing flags such as FLAG_NOT_FOCUSABLE or specific permission checks like SYSTEM_ALERT_WINDOW with rigorous verification of the calling package's signature. Additionally, implementing visual indicators for overlay windows can help users identify potential tapjacking attempts. On a broader architectural level, adopting zero-trust principles where every input event is verified against its intended target context before dispatching will prevent such logic errors from being exploitable. Regular code audits focusing on window management and permission checks are essential to maintain the integrity of the user interface layer and protect against these deceptive attacks.