The Passster WordPress plugin before 4.3.6 does not perform a post-status check before returning post content from an unauthenticated REST endpoint, allowing unauthenticated users to disclose the content of non-public (draft, private, and pending) posts on sites that have a captcha provider configured.
https://wpscan.com/vulnerability/fcca0d1c-1a5b-4515-8182-d68f0759b978/