A method, computer program product and system for preventing unauthorized access of confidential information. The transmission of data from a first user to a second user is detected. An authorization level corresponding to the second user is then determined. Furthermore, a probability that the authorization level corresponding to the second user and the data is accurate is generated. Additionally, a determination is made that the data includes sensitive information that the second user is not authorized to access based on the authorization level. Moreover, the data can be modified based on the probability, where the data is to be redacted if the probability is within a range of a threshold value or the data is to be blocked from transmission if the probability is above the range.