The wallet was not hacked. This is a software vulnerability that affects one of the contracts that the Parity wallet helps users create, the enhanced multi-sig. Some helpful information about this issue:<p>- The vulnerability is in Parity's "enhanced" multi-sig contract<p>- This affects Parity 1.5 and later<p>- Parity 1.5 was released on January 19, 2017 (have you created any multi-sigs in Parity since then?)<p>- The canonical multi-sig contract used in Mist / Ethereum Wallet does NOT have this vulnerability<p><a href="https://blog.parity.io/security-alert-high-2/" rel="nofollow">https://blog.parity.io/security-alert-high-2/</a>