This patch replaces SUPEE-9767. Previously installed SUPEE-9767 patch needs to be reverted prior to installing this version.
This patch provides protection against several types of security-related issues, including remote code execution, information leaks and cross-site scripting. - Added Jul 12, 2017
More information about the individual issues addressed by this patch as well as known issues is available in the patch details.
More details about the patch issues could be found here.