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.
Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:LA:L6.5/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:LOther