https://jenkins.io/blog/2016/05/11/security-update/

This security update prevents me from accessing HP_RUN_ID after the build has executed.

thanks

As a temporary workaround please set the following argument to your Jenkins server (to your jenkins.xml for example):
-Dhudson.model.ParametersAction.safeParameters=HP_RUN_ID
As being described on the security update:
https://jenkins.io/blog/2016/05/11/security-update/
Thanks.