CVE-2026-2559 Post SMTP <= 3.8.0 - Missing Authorization to Authenticated (Subscriber+) Office 365 OAuth Configuration Overwrite

The Post SMTP plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the handleoffice365oauthredirect function in all versions up to, and including, 3.8.0. This is due to the function being hooked to admininit without any currentusercan check ...