SYSTEMS AND METHODS FOR DETECTING MISUSE OF ONLINE SERVICE ACCESS TOKENS

The disclosed computer-implemented method for detecting misuse of online service access tokens may include (1) receiving a user permission token to access an online service that manages one or more user resources, (2) monitoring, based on utilization of the user permission token, usage data associated with an access token issued to a relying party for accessing the user resources managed by the online service, (3) identifying, based on the usage data, activity associated with the access token being misused by the relying party, and (4) performing, a security action that protects the user resources against the activity associated with the access token being misused by the relying party. Various other methods, systems, and computer-readable media are also disclosed.