There can be business sensitive information that are added to logs. When these logs are analyzed, the information is exposed.
To avoid this potential security pitfall, you can mask sensitive information (such as credit card numbers, access tokens, etc.) in the log file when the logs are created. You can also define patterns that need to be masked from the logs. For that, we need to wite a custom layout to mask sensitive information.
Guide for the implementation: https://logging.apache.org/log4j/2.x/manual/appenders.html#RewriteAppender