The banking sector plays dynamic and predominant role in Indian economy. After demonetization the customers are shift towards traditional banking practices to Ebanking practices. The rapid growth of electronic banking customer services which leads to occurrence of risk management in e-banking customer services. In connection with e-banking involves a variety of risks, the main risks are the monitored operational risk, legal risk, security risk, strategic Risks etc. Frequently, the customers faced operational risks are more compared to the other categories of risk that should be effect on the optimal activity between bank as well as customer transactions. The aim of the study is to understand the theoretical background of different categories of risk management in e-banking customer services in Karnataka Bank Ltd and to examine the demographic profile of e- banking users of Karnataka Bank Ltd. and to analysis the operational risks faced by the customers while using e- banking services and also to assess the legal risks faced by the customers while operating e- banking services in Karnataka Bank Ltd. Finally the last part of the study covers security risks faced by the customers while accesses ebanking services in Karnataka Bank Ltd, the sample size for study was only 75 Ebanking users of KBL. For the purpose of analysis of data based on normality test applied for non-parametric tests such as, mean, standard deviation, Wilcoxon Singed Z– Rank Test and Kruskal Wallies Z-Test. Finally this study results majority of the respondents has been positively opined that break down and time our services machines, lack of technological awareness, authentication of customers and confidentiality integrity of transaction and also privacy protection for banking transaction are the major operational and legal security risks faced the customers of Karnataka Bank Ltd.