DETECTION AND MITIGATION OF HIGH-RISK ONLINE ACTIVITY IN A COMPUTING PLATFORM

Technologies are provided for detection and mitigation of high-risk online activity. The detection and mitigation can be implemented in real-time. In some embodiments, a computing system can determine that a risk assessment for an online activity is unavailable from an in-memory storage. The computing system can obtain the risk assessment for the online activity from a second computing system configured to apply a prediction model to data defining the online activity. The risk assessment can comprise a risk score and a risk category. The computing system can update the in-memory storage to incorporate the data and the risk assessment, and can determine that the risk assessment is indicative of the online activity being high-risk activity. The computing system can then cause denial of access to a computing platform to a user device associated with the online activity.