Reproduction steps:

1. Register the server
2. Fill in the Host name/address, port, maintenance database, and username
3. Enter any role that exists in the system followed by arbitrary

SQL commands, eg.

joe; RESET ROLE; CREATE TABLE pwned()

What should happen:

Error: role "joe; RESET ROLE; CREATE TABLE pwned()" does not exist

What actually happens:

Connection to the database with the login role rather than the
intended role and a new "pwned" table in the default schema.