Update the WordPress Contest Gallery plugin to the latest available version (at least 14.0.0).
thiennv discovered and reported this Cross Site Scripting (XSS) vulnerability in WordPress Contest Gallery Plugin. This could allow a malicious actor to inject malicious scripts, such as redirects, advertisements, and other HTML payloads into your website which will be executed when guests visit your site. This vulnerability has been fixed in version 14.0.0.
Unauth. Stored CrossSite Scripting (XSS) vulnerability
Authenticated SQL Injection (SQLi) vulnerability
Missing Access Controls to Unauthenticated SQL injection (SQLi) / Email Address Disclosure vulnerability
Email Address Disclosure vulnerability
CrossSite Request Forgery (CSRF) vulnerability