An indorser to a negotiable instrument is generally primarily liable.

Indorser

In finance, someone who signs a negotiable instrument, such as a check or promissory note, over to someone else, thereby transferring the rights of that document.

Primarily Liable

The condition of being initially and directly responsible for fulfilling an obligation or debt, without shifting that responsibility to another party.

Negotiable Instrument

A written document guaranteeing the payment of a specific amount of money, either on demand or at a set time, with the payee's name mentioned.