The plugin does not validate and escape some of its block options before outputting them back in a page/post where the block is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.
As a contributor, add a "WL : FAQ" Gutenberg block to a post, and put the following payload in the "Additional CSS class(es)" advance settings of the block:
" onmouseover="alert(/XSS/)" style="background:red;"
The payload will be triggered when viewing/previewing the post and moving the mouse over the red block.
Note: A Template Builder needs to be present (one can be created by an admin at /wp-admin/edit.php?post_type=woolentor-template)