Apple often holds security as one of the biggest benefits of its smart home-based homekit, but no system is waterproof. A security hole in IOS 11.2 could provide unauthorized access to Homekit devices, which could at worst cause someone to unlock a front door or a connected garage door (which is not sold in Sweden). It writes 9to5mac.
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The security issue occurred if at least one of the household devices was updated to IOS 11.2.
However, the problem has already been solved by a server update. However, Apple had to turn off remote access to Homekit for family members and other invited people as a temporary measure.
There is therefore nothing that Homekit users need to do to secure the system, as the update has already been done on server- page. However, an update will be released next week that restores the ability of connected people to access Homekit.