There was a bug found in Jaxx.io wallet lately - anyone with 20 second access to you PCs network can get all keys to your wallets due to seed Jaxx generates.
The main problem is that the Jaxx software encrypts the mnemonic using a hard-coded encryption key, instead of making use of a strong user-supplied password. (As Daira Hopwood points out in the comments, using the PIN would not be sufficient.)
If you use Jaxx - move coins out ASAP.
Some people already claimed their coins were stolen. Full text - https://vxlabs.com/2017/06/10/extracting-the-jaxx-12-word-wallet-backup-phrase/
Literally right now, wallets from https://freewallet.org/ are getting cleared
If you used this service for some reason - move out ASAP.
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