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

A system for authenticating a user using multiple services, the system comprising:

• at least one hardware processor that is configured to:
• receive, from a client device, first credentials for a target service account;
• authenticate the target service account based on the first credentials;
• issue a redirecting request that directs the client device to at least one vouching service in response to authenticating the target service account;
• receive 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;
• determine whether the vouching service account is associated with the target service account based on the vouching token;
• and
• provide 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.

A non-transitory computer-readable medium containing computer-executable instructions that, when executed by a processor, cause the processor to perform a method for authenticating a user using multiple services, the method 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;
• determining whether the vouching service account is associated with the target service account based on the 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.