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SharedObjectManager scopes querysets to what a user may see, which includes other people's public and shared-with-them objects. Several mutating rule endpoints treated that visibility as permission to write. Generalise get_owned_object_or_403 into get_shared_object_or_error, which takes an explicit access level instead of inferring one: - READ requires the object to be visible; denial is 404 so the response does not confirm that an id exists. - EDIT requires ownership; denial is 403, but only after the visibility check, so 403 never leaks the existence of an invisible object. This matters for TransactionRuleAction, whose manager is unscoped. The previous owner_path resolved to a User and discarded the object, so it could not express visibility at all. via= now points at the governing SharedObject and is resolved with a plain getattr, so an unresolvable path raises instead of silently granting access. is_visible_to/is_editable_by replace is_accessible_by, which was never called and tested visibility == "shared", a value that does not exist in Visibility. Also fixes two further holes in the same module: - transaction_rule_delete fell through to delete() whenever the caller was not in shared_with, so any user could delete a public rule. Now only the owner deletes; a shared user revokes their own access. - transaction_rule_view was read-only but is now explicitly READ, so rules shared with a user stay viewable. The activate/deactivate control is hidden for rules the user does not own, instead of rendering a button that always fails. Refs GHSA-83g9-vjqf-2j5q