The EnvíaloSimple: Email Marketing y Newsletters plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.3. This is due to missing or incorrect nonce validation on the gallery_add function. This makes it possible for unauthenticated attackers to upload malicious files via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Deserialization of Untrusted Data vulnerability in EnvialoSimple EnvíaloSimple: Email Marketing y Newsletters.This issue affects EnvíaloSimple: Email Marketing y Newsletters: from n/a through 2.1.

Multiple cross-site scripting (XSS) vulnerabilities in paginas/vista-previa-form.php in the EnvialoSimple: Email Marketing and Newsletters (envialosimple-email-marketing-y-newsletters-gratis) plugin before 1.98 for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) FormID or (2) AdministratorID parameter.