Musical.ly Inc., musical.ly - your video social network, 6.1.6, 2017-10-03, iOS application uses a hard-coded key for encryption. Data stored using this key can be decrypted by anyone able to access this key.

The TikTok (formerly Musical.ly) application 12.2.0 for Android and iOS performs unencrypted transmission of images, videos, and likes. This allows an attacker to extract private sensitive information by sniffing network traffic.

The TikTok application before 23.7.3 for Android allows account takeover. A crafted URL (unvalidated deeplink) can force the com.zhiliaoapp.musically WebView to load an arbitrary website. This may allow an attacker to leverage an attached JavaScript interface for the takeover with one click.