The Masterstudy - Education WordPress Theme theme for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.8.151. This is due to missing authorization and nonce validation on the masterstudy_ms_stm_set_discard_transient AJAX action. This makes it possible for authenticated attackers, with Subscriber-level access and above, to elevate their privileges to Administrator by setting the stm_developer_access_token transient and using the developer access auto-login flow to obtain administrator session cookies.