Description
In Drupal 8 prior to 8.3.4; The file REST resource does not properly validate some fields when manipulating files. A site is only affected by this if the site has the RESTful Web Services (rest) module enabled, the file REST resource is enabled and allows PATCH requests, and an attacker can get or register a user account on the site with permissions to upload files and to modify the file resource.
Remediation
References
Related Vulnerabilities
MySQL CVE-2012-0583 Vulnerability (CVE-2012-0583)
WordPress Plugin Gallery by BestWebSoft Cross-Site Scripting (4.4.9)
VirtueMart access control bypass
WordPress Plugin Contact Bank-Contact Form Builder for WordPress Cross-Site Scripting (3.0.30)
WordPress 4.2.x Cross-Site Scripting Vulnerability (4.2 - 4.2.7)