The Post SMTP – WP SMTP Plugin with Email Logs and Mobile App for Failure Notifications – Gmail SMTP, Office 365, Brevo, Mailgun, Amazon SES and more plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'update_post_smtp_pro_option_callback' function in all versions up to, and including, 3.4.1. This makes it possible for authenticated attackers, with Subscriber-level access and above, to enable pro extensions.

The YaySMTP and Email Logs: Amazon SES, SendGrid, Outlook, Mailgun, Brevo, Google and Any SMTP Service plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions 2.4.9 to 2.6.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Note: The vulnerability has been initially patched in version 2.4.8 and was reintroduced in version 2.4.9 with the removal of the wp_kses_post() built-in WordPress sanitization function.

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The Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue) plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.1.87. This is due to missing or incorrect nonce validation on the Init() function. This makes it possible for unauthenticated attackers to log out of a Brevo connection via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

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Cross-Site Request Forgery (CSRF) vulnerability in Brevo Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue.This issue affects Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue: from n/a through 3.1.82.

sendinblue

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Brevo Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue allows Reflected XSS.This issue affects Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue: from n/a through 3.1.77.

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Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Brevo Sendinblue for WooCommerce allows Relative Path Traversal, Manipulating Web Input to File System Calls.This issue affects Sendinblue for WooCommerce: from n/a through 4.0.17.