DescriptionA flaw was found in PostgreSQL. A late privilege drop in REFRESH MATERIALIZED VIEW CONCURRENTLY in PostgreSQL can allow an object creator to execute arbitrary SQL functions as the command issuer. The command intends to run SQL functions as the owner of the materialized view, enabling safe refresh of untrusted materialized views. The attack requires luring the victim, a superuser or member of one of the attacker's roles, into running REFRESH MATERIALIZED VIEW CONCURRENTLY on the attacker's materialized view.A flaw was found in PostgreSQL. A late privilege drop in REFRESH MATERIALIZED VIEW CONCURRENTLY in PostgreSQL can allow an object creator to execute arbitrary SQL functions as the command issuer. The command intends to run SQL functions as the owner of the materialized view, enabling safe refresh of untrusted materialized views. The attack requires luring the victim, a superuser or member of one of the attacker's roles, into running REFRESH MATERIALIZED VIEW CONCURRENTLY on the attacker's materialized view.