Description
In Drupal 8 prior to 8.3.7; When using the REST API, users without the correct permission can post comments via REST that are approved even if the user does not have permission to post approved comments. This issue only affects sites that have the RESTful Web Services (rest) module enabled, the comment entity REST resource enabled, and where an attacker can access a user account on the site with permissions to post comments, or where anonymous users can post comments.
Remediation
References
Related Vulnerabilities
Drupal Core 4.7.x Cross-Site Scripting (4.7.0 - 4.7.7)
Oracle Application Server Other Vulnerability (CVE-2000-0169)
WordPress Plugin Advanced Custom Fields (ACF) Cross-Site Scripting (4.4.7)
Joomla! Core Multiple Vulnerabilities (2.5.0 - 3.10.6)
OpenSSL Inadequate Encryption Strength Vulnerability (CVE-2014-0224)