Description

The LearnPress – WordPress LMS Plugin for Create and Sell Online Courses plugin for WordPress is vulnerable to payment bypass through user-controlled key in all versions up to, and including, 4.3.5. This is due to improper handling of user-supplied request parameters in the REST API endpoint, which passes the unsanitized parameter array to the add_to_cart() function where array_merge() allows attacker-controlled values to overwrite hardcoded defaults. This makes it possible for authenticated attackers, with subscriber-level access and above, to enroll in any paid course entirely free of charge by supplying a quantity value of zero, which causes the order total to calculate as $0 and bypasses all payment gateway requirements.

Weaknesses 1

References 8

• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learnpress/tags/4.3.3/inc/cart/class-lp-cart.php#L105
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learnpress/tags/4.3.3/inc/cart/class-lp-cart.php#L180
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learnpress/tags/4.3.3/inc/rest-api/v1/frontend/class-lp-rest-courses-controller.php#L474
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learnpress/trunk/inc/cart/class-lp-cart.php#L105
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learnpress/trunk/inc/cart/class-lp-cart.php#L180
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/learnpress/trunk/inc/rest-api/v1/frontend/class-lp-rest-courses-controller.php#L474
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3521636%40learnpress&new=3521636%40learnpress&sfp_email=&sfph_mail=
• wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/564ec4a6-20d3-4b46-8637-fc1de586e19a?source=cve

Remediation