An issue was discovered in by-email/by-email.php in the Invite Anyone plugin before 1.3.15 for WordPress. A user is able to change the subject and the body of the invitation mail that should be immutable, which facilitates a social engineering attack.

WordPress Invite Anyone plugin <= 1.4.7 - Reflected Cross Site Scripting (XSS) vulnerability

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Boone Gorges Invite Anyone allows Reflected XSS.This issue affects Invite Anyone: from n/a through 1.4.7.