wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php:263Checks if the user has permissions to make the request.
true|WP_Error protected function do_permissions_check() { /* * Verify if the current user has edit_theme_options capability. * This capability is required to access the widgets screen. */ if ( ! current_user_can( 'edit_theme_options' ) ) { return new WP_Error( 'rest_cannot_manage_widgets', __( 'Sorry, you are not allowed to manage widgets on this site.' ), array( 'status' => rest_authorization_required_code() ) ); } return true; }Introduced in 5.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.