Whale browser before 3.12.129.18 allowed extensions to replace JavaScript files of the HWP viewer website which could access to local HWP files. When the HWP files were opened, the replaced script could read the files.
Whale Browser before 1.3.48.4 displays no URL information but only a title of a web page on the browser's address bar when visiting a non-http page, which allows an attacker to display a malicious web page with a fake domain name.