WFFM module hotfix for Sitecore 8.0 update 6


I would like to share the recent issues one of our team have encountered on post upgraded of Sitecore from 8.0 update 3 to update 6(Team also upgraded the WFFM module along with this Sitecore upgrade)

Issue Description:
During our performance test we encountered a High CPU utilization on our all Content Delivery Servers.

Root cause:
Web Forms for Marketers modules uses a dictionary that is not protected from concurrent access. As a result it becomes corrupted and blocks requests.

Hot fix details:
Please find the hotfix available at the following URL:

Be aware that the hotfix was built specifically for Web Forms for Marketers 8.0 rev. 151127 (Update-6), and you should ensure that your solution is updated to this build prior to installing it.

Note that the current hotfix is a Sitecore package and you should install it using the Install Package Wizard application.

After applying the hotfix to your solution, it will not be recommended to install other Web Forms for Marketers module updates until Sitecore includes the changes associated with this hotfix in an official product update. To be able to monitor this, please use the reference number 97688.


More information about this public reference number can be found here: https://kb.sitecore.net/articles/853187

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