services/core/java/com/android/server/pm/PackageManagerService.java in the framework APIs in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-08-01 allows attackers to increase intent-filter priority via a crafted application, aka internal bug 27450489.