As of December 1, 2013, Oracle E-Business Suite 11.5.10 moved into Sustaining Support. Normally, Oracle Sustaining Support does not include security fixes in the form of Critical Patch Updates. However, for 11.5.10, there is an exception until December 2015 and Severity 1 fixes, payroll/1099 updates, and Critical Patch Updates will be available.
Oracle E-Business Suite Critical Patch Updates (CPU) will be available for 11.5.10 up to and including the October 2015 CPU. No Oracle E-Business Suite CPUs or security fixes will be released after the October 2015 CPU. In order to continue applying security patches after October 2015, you will need to upgrade to at least Oracle E-Business Suite 12.1. CPU support for 12.0 will end January 2015 with the end of Extended Support.
CPUs for the Oracle E-Business Suite database will be dependent on the version being used and currently CPUs are only available for 18.104.22.168, 22.214.171.124, 126.96.36.199, and 188.8.131.52. For the application server, which is very old and is basically on life support, was last patched in the October 2012 CPU.