CVE-2025-12887: Saadiqbal Post Smtp – Complete Email Deliverability And Smtp Solution With Email Logs, Alerts, Backup Smtp & Mobile App

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The Post SMTP plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.6.1. This is due to the plugin not properly verifying that a user is authorized to update OAuth tokens on the 'handle_gmail_oauth_redirect' function. This makes it possible for authenticated attackers, with subscriber level access and above, to inject invalid or attacker-controlled OAuth credentials. CVE-2025-67563 appears to be a duplicate of this issue.

Affected products

• Saadiqbal Post Smtp – Complete Email Deliverability And Smtp Solution With Email Logs, Alerts, Backup Smtp & Mobile App: up to and including 3.6.1

Published 2025-12-03. Last modified 2026-06-17.