Methods, systems, and media for authenticating users using multiple services

Methods, systems, and media for automatically authenticating a user account using multiple services are provided. In accordance with some embodiments of the disclosed subject matter, methods for authenticating a user using multiple services are provided, the methods comprising: receiving, from a client device, first credentials for a target service account; authenticating the target service account based on the first credentials; issuing a redirecting request that directs the client device to at least one vouching service in response to authenticating the target service account; receiving a vouching response indicating that the client device has authenticated a vouching service account with the at least one vouching service, wherein the vouching response includes a vouching token; and providing the client device with access to the target service account in response to determining that the vouching service account is associated with the target service account.