Oracle released Bundle Patch 2 for SOA Suite 12.1.3 in April 2015 and Patch 3 in July 2015.Navigate here for an overview of all Bundle Patches for Fusion Middleware 11g and 12c

Download the Bundle Patches from My Oracle Support: https://support.oracle.com/epmos/faces/DocContentDisplay?_afrLoop=521750086943457&id=1485949.1&_afrWindowMode=0&_adf.ctrl-state=ggjd5lum8_9 .

Instructions on installing the Bundle Patches on top of either the base 12.1.3 installation or on Bundle Patch 1 (January 2015) are provided in this Blog Article by Jan van Zoggel: http://www.rubix.nl/blogs/patching-your-jdeveloper-1213-soa-bundle-patch-121302 .