Please download the relevant patch based on the product you use following the matrix below. The patch can also be downloaded from http://wso2.com/security-patch-releases/.
WSO2 API Manager
It is highly recommended to migrate older versions of the WSO2 products to the latest to receive security fixes.
Note: If you are a WSO2 customer with Support Subscription, please use WSO2 Update Manager (WUM) updates in order to apply the fix. This patch is intended for WSO2 community (free) users.
If you are using newer versions of WSO2 API Manager than the ones mentioned in the “SOLUTION” section, this vulnerability is fixed.