The wp-courses plugin through 2.0.27 for WordPress allows remote attackers to bypass the intended payment step (for course videos and materials) by using the /wp-json REST API, as exploited in the wild in September 2020. This occurs because show_in_rest is enabled for custom post types (e.g., /wp-json/wp/v2/course and /wp-json/wp/v2/lesson exist).
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26876
Reference (s):
- https://plugins.trac.wordpress.org/changeset/2388997
- https://plugins.trac.wordpress.org/changeset/2389243
- https://www.redtimmy.com/critical-information-disclosure-on-wp-courses-plugin-exposes-private-course-videos-and-materials/