Information security is always one of those topics that is hard to report on, especially with the sheer number of devices available today. The problem lies in what is dangerous, what is bad, or what is no-big-deal. Frankly, opinions vary on the risks and threats involved.
One neat feature in Windows Phone is the ability to select text and hit the Search key. The Windows Phone OS copies the information over to Bing (or Cortana), and it lets you search without having to copy/paste the selection. It is super useful and certainly convenient for speedy searches.
However, there does seem to be one instance where this feature works where it should not: password fields.