CVE-2025-48646: Android Privilege Escalation Vulnerability

CVE-2025-48646 Overview

CVE-2025-48646 is a confused deputy vulnerability in the executeRequest method of ActivityStarter.java within Google Android. This flaw allows a malicious application to leverage the privileges of a trusted system component to launch activities in an unrestricted manner, bypassing normal security restrictions. The vulnerability enables local privilege escalation without requiring additional execution privileges, though user interaction is necessary for successful exploitation.

Critical Impact

This confused deputy vulnerability allows attackers to escalate privileges locally on affected Android devices, potentially gaining unauthorized access to sensitive system functions and data through malicious activity launches.

Affected Products

• Google Android 14.0
• Google Android 15.0
• Google Android 16.0 (including QPR2 Beta 1, Beta 2, and Beta 3)

Discovery Timeline

• 2026-03-02 - CVE-2025-48646 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2025-48646

Vulnerability Analysis

This vulnerability is classified as CWE-441 (Unintended Proxy or Intermediary), commonly known as a "confused deputy" attack. In this scenario, the ActivityStarter component—a trusted system service responsible for managing activity launches in Android—can be manipulated by a malicious application to perform actions on its behalf that the malicious app would not normally be permitted to execute directly.

The flaw resides in the executeRequest method within ActivityStarter.java, where insufficient validation of activity launch requests allows an attacker to trick the system into launching arbitrary activities with elevated privileges. Since ActivityStarter operates as a privileged system component, any activities it launches inherit its privilege level, effectively bypassing Android's permission model.

The attack requires local access to the device and user interaction (such as clicking a malicious link or opening a crafted application), but does not require the attacker to have any special execution privileges beforehand.

Root Cause

The root cause of this vulnerability lies in improper validation within the executeRequest method of ActivityStarter.java. The method fails to adequately verify the origin and intent of activity launch requests, allowing a lower-privileged component to exploit the trust relationship with ActivityStarter. This enables the confused deputy attack pattern, where the privileged component is deceived into performing unauthorized actions on behalf of an attacker-controlled application.

Attack Vector

The attack vector is local, requiring the attacker to have a malicious application installed on the target device. The exploitation flow typically involves:

1. A malicious application crafts a specially designed intent or request
2. The request is sent to the ActivityStarter component through inter-process communication
3. Due to insufficient validation in executeRequest, the ActivityStarter processes the request as legitimate
4. The system launches the requested activity with elevated privileges
5. The attacker gains unauthorized access to protected system functions or sensitive data

The vulnerability requires user interaction to trigger, typically through social engineering to install a malicious application or interact with crafted content.

Detection Methods for CVE-2025-48646

Indicators of Compromise

• Unusual activity launch patterns originating from the ActivityStarter component with unexpected caller packages
• Unexpected privilege elevation events in system logs associated with activity transitions
• Anomalous inter-process communication patterns targeting ActivityStarter.java

Detection Strategies

• Monitor Android system logs for suspicious activity launch requests, particularly those involving privilege mismatches between the caller and the launched activity
• Implement runtime application self-protection (RASP) to detect confused deputy attack patterns
• Deploy endpoint detection solutions capable of monitoring Android framework behavior for anomalous activity transitions

Monitoring Recommendations

• Enable verbose logging for ActivityStarter to capture detailed request information for forensic analysis
• Implement behavioral analysis to detect applications attempting to leverage system components for privilege escalation
• Configure mobile threat defense solutions to alert on suspicious intent patterns and unauthorized activity launches

How to Mitigate CVE-2025-48646

Immediate Actions Required

• Apply the Android security patches from the March 2026 security bulletin immediately
• Ensure devices are configured to receive automatic security updates from Google
• Review installed applications and remove any untrusted or suspicious apps that may attempt to exploit this vulnerability
• Consider enabling Google Play Protect for additional runtime protection against malicious applications

Patch Information

Google has addressed this vulnerability in the Android Security Bulletin dated March 1, 2026. Device manufacturers and carriers are responsible for distributing the patch to end-user devices. Users should check their device settings for available system updates and apply them as soon as possible.

Workarounds

• Avoid installing applications from untrusted sources or third-party app stores
• Enable "Verify apps" feature in Android settings to scan applications for potentially harmful behavior
• Exercise caution when interacting with links or content from unknown sources that may trigger malicious activity launches
• Consider using a mobile device management (MDM) solution to enforce application whitelisting on enterprise devices