Vulnerabilities and security researches formailin mailin

Mar 29, 2026

CVE, Research URL: CVE-2025-14799
Home page URL: Security reports for Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Application: Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Date: Feb 18, 2026
Research Description: The Brevo - Email, SMS, Web Push, Chat, and more. plugin for WordPress is vulnerable to authorization bypass due to type juggling in all versions up to, and including, 3.3.0. This is due to the use of loose comparison (==) instead of strict comparison (===) when validating the installation ID in the `/wp-json/mailin/v1/mailin_disconnect` REST API endpoint. This makes it possible for unauthenticated attackers to disconnect the Brevo integration, delete the API key, remove all subscription forms, and reset plugin settings by sending a boolean `true` value for the `id` parameter, which bypasses the authorization check through PHP type juggling.
Affected versions: max 3.3.1.
Status: vulnerable

Oct 10, 2024

CVE, Research URL: CVE-2024-8477
Home page URL: Security reports for Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Application: Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Date: Oct 10, 2024
Research Description: 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.
Affected versions: max 3.1.88.
Status: vulnerable

Aug 20, 2024

CVE, Research URL: CVE-2024-43287
Home page URL: Security reports for Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Application: Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Date: Aug 27, 2024
Research Description: 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.
Affected versions: max 3.1.83.
Status: vulnerable

Jun 06, 2024

CVE, Research URL: CVE-2021-24874
Home page URL: Security reports for Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Application: Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Date: Feb 14, 2022
Research Description: The Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue WordPress plugin before 3.1.31 does not escape the lang and pid parameter before outputting them back in attributes, leading to Reflected Cross-Site Scripting issues
Affected versions: max 3.1.31.
Status: vulnerable

CVE, Research URL: CVE-2021-24923
Home page URL: Security reports for Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Application: Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Date: Jan 24, 2022
Research Description: The Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue WordPress plugin before 3.1.25 does not escape the sib-statistics-date parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting issue
Affected versions: max 3.1.61.
Status: vulnerable

CVE, Research URL: CVE-2024-35668
Home page URL: Security reports for Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Application: Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Date: Jun 04, 2024
Research Description: 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.
Affected versions: max 3.1.78.
Status: vulnerable

CVE, Research URL: CVE-2023-2472
Home page URL: Security reports for Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Application: Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue)
Date: Jun 05, 2023
Research Description: The Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue WordPress plugin before 3.1.61 does not sanitise and escape a parameter before outputting it back in the admin dashboard when the WPML plugin is also active and configured, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin
Affected versions: max 3.1.78.
Status: vulnerable