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Fragment Injection


The application is vulnerable to Fragment Injection caused either by an unsafe implementation of PreferenceActivity or an insecure configuration of isValidFragment.


Use malicious fragments to exploit different vulnerabilities.


  • Set the attribute exported to false to avoid the attempt of foreign applications to exploit the vulnerability.
  • Ensure the application is running with targetSdkVersion higher than 19.
  • Set a whitelist of trusted fragments and validate them through the implementation of isValidFragment.


Authenticated attacker from the Internet.

Expected Remediation Time

⌚ minutes.


Default score using CVSS 3.1. It may change depending on the context of the src.


  • Attack vector: N
  • Attack complexity: H
  • Privileges required: L
  • User interaction: N
  • Scope: U
  • Confidentiality: N
  • Integrity: L
  • Availability: N


  • Exploit code madurity: P
  • Remediation level: O
  • Report confidence: R


  • Vector string: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:R
  • Score:
    • Base: 3.1
    • Temporal: 2.7
  • Severity:
    • Base: Low
    • Temporal: Low

Compliant code

Implement a check for every fragment introduced to the application

public boolean isValidFragment(String fragmentName) {
return MyFragment.class.getName().equals(fragmentName);

Non compliant code

There are unverified inputs that are used to put fragments into the application

String initialFragment = getIntent().getStringExtra(EXTRA_SHOW_FRAGMENT);
Bundle initialArguments = getIntent().getBundleExtra(EXTRA_SHOW_FRAGMENT_ARGUMENTS);
if (savedInstanceState != null) {
//Handle Exception
} else {
if (initialFragment != null && mSinglePane) {
// Add Fragment to the application



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