Ultimate Instagram Feed <= 1.3.1 - Authenticated Cross-Site Scripting (XSS)

Description

In regards to https://wpvulndb.com/vulnerabilities/8947, the XSS vulnerability remains in 1.3 and 1.3.1 as the author passes _GET['access_token'] to sanitize_text_field(). However, the value is inserted into an attribute of an element, and sanitize_text_field() does not filter for quotes (single or double). Therefore, injecting %22+onblur%3D%22alert%281%29 for access_token will still result in an exploitable injection. I have reached out to the author but have not received a response yet. I've also contracted the plugin team at WordPress.org