Open-source portal implementation-liferay's Portlet session processing (3)

Iii. Problems
Due to the above reasons, liferay may face the following problems:
-The user originally wanted to save the private data to the session of the application, but actually saved it to the session object of the portal system.
-Other applications can freely access session data that does not belong to this application.
-Other systems can access the session data of the portal system at will.
-Different applications cannot use the same key to store data. Otherwise, data will be overwritten.

The above is my opinion on liferay. Please give me more advice!