In yet another case where customers have become guinea pigs to beta test patches, Microsoft has stopped distributing the .NET Framework July 2018 update due to customer angst due to critical business applications that have stopped working.
As a team, we regret that this release was shipped with this flaw. This release was tested using our regular and extensive testing process. We discovered while investigating this issue that we have a test hole for the specific combination of COM activation and restricted permissions, including impersonation. We will be mitigating that gap going forward. Again, we are sorry for any inconvenience that this product flaw has caused.
Microsoft is recommending uninstalling the update if it has been installed already.
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