The Quotes llama WordPress plugin before 3.1.6 does not properly sanitize and escape a user-supplied parameter before using it in a SQL query, allowing unauthenticated attackers to perform UNION-based SQL injection and read arbitrary data from the database, including password hashes.
https://wpscan.com/vulnerability/39d038f6-f009-4274-a8a7-9d7c2597ec85/