The WPForms Lite WordPress plugin from 1.5.0.1 to 2.0.2 does not remove shortcode delimiters from submitted field values before writing them back into the rendered form, allowing unauthenticated users to execute arbitrary shortcodes registered on the site and read the details of attachments belonging to non-public posts.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1