Django 1.11 before 1.11.28, 2.2 before 2.2.10, and 3.0 before 3.0.3
allows SQL Injection if untrusted data is used as a StringAgg delimiter
(e.g., in Django applications that offer downloads of data as a series
of rows with a user-specified column delimiter). By passing a suitably
crafted delimiter to a contrib.postgres.aggregates.StringAgg instance,
it was possible to break escaping and inject malicious SQL.