You might have heard this already, either via email or somewhere else on the web, but in case you haven’t: Ubisoft have had one of their websites exploited, allowing people to gain access to the backend of their online systems.
This means certain people have gained access to user names, email addresses and encrypted versions of the passwords stored. Fortunately, no personal payment information was compromised, so your card information will be safe.
Nonetheless, if you have accounts which use the same (or a similar) password in combination with the email address or UPlay username, then it’s a really good idea to change them. I don’t think any of my ones use the same combination, thankfully, though I’ve changed my Ubisoft password as instructed to be safe.
Let us know if you have been affected by this hack in any way.