Answer Yes. You must update the userFilter in the LDAP settings in the WebSphere® Application Server administrative console. For example, given the case where administrative users have "uid" but not "cn", and non-administrative users have "cn" but not "uid", you can allow both sets of users to log in by updating the userFilter to accommodate both attributes:
Check with your LDAP administrator to verify the userFilter.
NOTE: By using multiple attributes for login, this will force the requirement of uniqueness across both attributes. If UserA's cn value is identical to UserB's uid value, problems could occur during login.