STphp EasyNews PRO 4.0 stores sensitive information under the web root with insufficient access control, which allows remote attackers to obtain usernames, email addresses, and password hashes via a direct request for data/users.txt.

Cross-site scripting (XSS) vulnerability in STphp EasyNews PRO 4.0 allows remote attackers to inject arbitrary web script or HTML via a news post, which is stored in news/ without sanitization.

Cross-site request forgery (CSRF) vulnerability in STphp EasyNews PRO 4.0 allows remote attackers to change the admin password via (1) a certain HTML form that is posted automatically by JavaScript or (2) a news post.