NukeViet versions prior to 4.6.00 contain a reflected cross-site scripting (XSS) vulnerability in the Comment module via the status_comment URL parameter. The parameter accepts base64-encoded HTML/JavaScript that is decoded server-side and rendered without escaping, allowing arbitrary script execution. Additionally, the anti-forgery token checkss is derived from a static site-wide value rather than a per-session value, making it reusable across users and enabling exploitation via crafted URLs without authentication. This vulnerability allows attackers to execute malicious scripts in victims' browsers within the site's origin, potentially capturing sensitive information such as credentials. The vulnerability has a high severity rating with a CVSS 3.1 base score of 8.2.