OWASP M5 Explained: Why HTTPS Alone Does Not Secure Mobile App Traffic
The fifth entry in OWASP's Mobile Top 10 2024 list, M5: Insecure Communication, warns that simply using HTTPS is not enough to protect mobile app data in transit. The risk covers all communication channels a mobile device may use, including Bluetooth, NFC, SMS, WiFi, and TCP/IP, not just web traffic. Developers must also ensure correct TLS configuration, consistent endpoint security, and scrutinize third-party SDKs and WebViews that may silently transmit data over plaintext connections. In frameworks like React Native, the network layer spans JavaScript code, platform-level settings, and native modules, meaning a misconfiguration in any one layer can expose the entire app. OWASP rates M5 as easy to exploit, since an attacker on the same network with a basic proxy tool can intercept improperly secured traffic without advanced techniques.
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