Type Juggling Leads to Two Vulnerabilities in POST SMTP Mailer WordPress Plugin

On December 14th, 2023, during our Bug Bounty Program Holiday Bug Extravaganza, we received a submission for an Authorization Bypass vulnerability in POST SMTP Mailer, a WordPress plugin with over 300,000+ active installations. This vulnerability makes it possible for unauthenticated threat actors to reset the API key used to authenticate to the mailer and view logs, including password reset emails on WordPress sites that use this plugin. We also received another submission shortly after for an Unauthenticated Stored Cross-Site Scripting vulnerability in POST SMTP Mailer plugin from another researcher. This vulnerability enables threat actors to inject malicious web scripts into pages.

This post was originally published on Wordfence by István Márton.

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