CVE-2025-48621
📋 TL;DR
This CVE describes a tapjacking vulnerability in Android's DefaultTransitionHandler that allows malicious apps to overlay deceptive UI elements over legitimate apps. Attackers can trick users into granting permissions or performing actions they didn't intend, leading to local privilege escalation. This affects Android devices with vulnerable versions of the framework.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise where attacker gains full system privileges, installs persistent malware, accesses sensitive data, and controls device functions without user knowledge.
Likely Case
Limited privilege escalation where attacker gains access to specific app permissions, steals session tokens or credentials, or performs unauthorized transactions within vulnerable apps.
If Mitigated
Minimal impact with proper app sandboxing, permission controls, and user awareness preventing successful exploitation attempts.
🎯 Exploit Status
Exploitation requires user interaction (tapjacking) and a malicious app to be installed. The attack leverages insecure default settings in transition handling.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Update December 2025
Vendor Advisory: https://source.android.com/security/bulletin/2025-12-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > System update. 2. Install the December 2025 security update. 3. Restart device after installation completes. 4. Verify update applied successfully.
🔧 Temporary Workarounds
Disable overlay permissions for untrusted apps
androidPrevent apps from drawing over other apps by restricting SYSTEM_ALERT_WINDOW permission
adb shell appops set <package_name> SYSTEM_ALERT_WINDOW deny
Enable Google Play Protect
androidUse built-in malware scanning to detect and block malicious apps attempting tapjacking
Settings > Security > Google Play Protect > Scan device for security threats
🧯 If You Can't Patch
- Implement strict app installation policies allowing only trusted sources
- Educate users about tapjacking risks and encourage verifying app permissions before granting
🔍 How to Verify
Check if Vulnerable:
Check Android build fingerprint against vulnerable versions in December 2025 security bulletinCheck Version:
adb shell getprop ro.build.fingerprintVerify Fix Applied:
Verify security patch level is December 2025 or later in Settings > About phone > Android version📡 Detection & Monitoring
Log Indicators:
- Multiple SYSTEM_ALERT_WINDOW permission requests
- Unexpected overlay window creation events
- App transition anomalies in system logs
Network Indicators:
- None - this is a local privilege escalation vulnerability
SIEM Query:
source="android_system_logs" AND ("SYSTEM_ALERT_WINDOW" OR "overlay" OR "tapjacking")