SUMMARY As far as I am informed, right now, once an application makes use of the credentials store (kwallet), it can basically access all credentials, including those of other applications. It'd therefore be a security enhancement if it could only access credentials which are associated with this very application. One way to to associate it, could be to check if it started under a certain path like `/usr/bin/my-application`.
*** This bug has been marked as a duplicate of bug 432713 ***