You're conflating privacy and security (which are similar I know).

If you know my entire banking history that's a privacy issue (which jfaucett was ok with). However, if you are able to access my account and take money, that's a security problem.

The line can get really fuzzy sometimes, but they are different issues.

So did Wikileaks violate privacy or security when they released data containing unredacted credit card and social security numbers?

Security. Although SSN in theory should be a privacy issue. Credit card numbers are clearly similar to keys. They are the keys to your bank balance.