From 665bf40a132a857f1790de2aebffb14f85da7b6a Mon Sep 17 00:00:00 2001 From: Robert Haas Date: Mon, 20 Jul 2026 13:36:39 -0400 Subject: [PATCH] doc: Granting TRIGGER or REFERENCES on table is dangerous. It's always been the case that granting these privileges to users that you don't fully trust was a bad idea, but it hasn't always been obvious to people reading the documentation that this is the case. To prevent confusion, and also repeated reports to pgsql-security, mention it explicitly. Discussion: http://postgr.es/m/CA+TgmobrjCHBuWHrvX3=2vndUCO2thUOdevrCcMDFW86cqCYvw@mail.gmail.com Reviewed-by: Nathan Bossart Backpatch-through: 14 --- doc/src/sgml/ddl.sgml | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml index 915ea10a860..7e1a8e0af52 100644 --- a/doc/src/sgml/ddl.sgml +++ b/doc/src/sgml/ddl.sgml @@ -1779,7 +1779,11 @@ REVOKE ALL ON accounts FROM PUBLIC; Allows creation of a foreign key constraint referencing a - table, or specific column(s) of a table. + table, or specific column(s) of a table. Great care should be taken when + granting this privilege, since a user who creates a foreign key can arrange + for enforcement of that foreign key to call an arbitrary function, such as + a cast function, and such functions will be called with the privileges of + the table owner. @@ -1788,7 +1792,9 @@ REVOKE ALL ON accounts FROM PUBLIC; TRIGGER - Allows creation of a trigger on a table, view, etc. + Allows creation of a trigger on a table, view, etc. Great care should be + taken when granting this privilege, since any triggers added to a table + or view will be executed with the privileges of users who modify it.