diff --git a/inc/class-wp-saml-auth.php b/inc/class-wp-saml-auth.php
index 5a33f9f..daa00b7 100644
--- a/inc/class-wp-saml-auth.php
+++ b/inc/class-wp-saml-auth.php
@@ -282,6 +282,14 @@ function() use ( $redirect_to ) {
 			return new WP_Error( 'wp_saml_auth_invalid_provider', __( 'Invalid provider specified for SAML authentication', 'wp-saml-auth' ) );
 		}
 
+		/**
+		 * Allows to modify attributes before the SAML authentication.
+		 *
+		 * @param array  $attributes All attributes received from the SAML response.
+		 * @param object $provider   Provider instance currently in use.
+		 */
+		$attributes = apply_filters( 'wp_saml_auth_attributes', $attributes, $this->provider );
+
 		/**
 		 * Runs before the SAML authentication dance proceeds
 		 *