Text Rider 2.4 allows attackers to bypass authentication and upload files without providing a valid password by obtaining the MD5 hash of the password (possibly via another vulnerability that reads it from a data file), then including the hash in a cookie.

Text Rider 2.4 stores sensitive data in the data directory under the web document root with insufficient access control, which allows remote attackers to obtain usernames and password hashes by directly accessing data/userlist.txt.