State Bank Of India [SBI] — Bank's internal website (CBS) is being used by its employees to gain personal info about other employees

Hi,
My sister works in SBI and a guy from SBI got access of her name, account no, phone number, house address, work location, in time, out time, checked in, leave and all kind of personal details and this guy is creeping her out and this level of security is not acceptable and makes her feel very insecure.There are lot o[censored]nwanted messages being sent to her in whatsapp, messages because of this information being with him.
He himself said that he accesses all her details from CBS and some screen no.9600 to know all these things.Please have a limit to things which a colleague can have access to.You cannot guarantee good character and discipline just because they can crack a tough exam.