Some masked passwords for Vault are unable to decode properly since they were created with old/faulty version of Base64Util class.
Fix contains fallback when there is improper formed Base64 string and tries to prefix it with '0' as this was the original problem in Base64Util.
This issue is related to: https://bugzilla.redhat.com/show_bug.cgi?id=1125004
Peter, could you check if this is fixed already?