During a security audit, security analysts discover that an attacker has been repeatedly querying a black-box machine learning model to infer whether certain sensitive data points were part of the…

During a security audit, security analysts discover that an attacker has been repeatedly querying a black-box machine learning model to infer whether certain sensitive data points were part of the training dataset. By doing so, the attacker was able to determine if a specific individual's data was used in training. What threat does this attack represent?