The Schema & Structured Data for WP & AMP WordPress plugin before 1.66 does not correctly verify the ownership or the moderation status of a comment before returning its content, allowing unauthenticated users to read the content of comments still awaiting moderation or marked as spam.
https://wpscan.com/vulnerability/1ed1a2a1-e23d-4c4c-a933-f55b3e14ad09/