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Certain bulk action calls with a before_transaction hook and no after_transaction hook, will call the before_transaction hook before authorization is checked and a Forbidden error is returned, when called as a bulk action.

When using filter authorization, two edge cases could cause the policy compiler/authorizer to generate a permissive filter:

Ash.Type.Module.cast_input/2 unconditionally creates a new Erlang atom via Module.concat([value]) for any user-supplied binary string that starts with "Elixir.", before verifying whether the referenced module exists. Because Erlang atoms are never garbage-collected and the BEAM atom table has a hard default limit of approximately 1,048,576 entries, an attacker who can submit values to any resource attribute or argument of type :module can exhaust this table and crash the entire BEAM VM, taking down the application.