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You might have seen a few posts about this but summarising: if you run a website that's built on PHP (yer WordPresses etc) and you've access to the version of PHP (backend) then you should probably update it to the latest version as soon as you can after 3pm today (UK timezone, 2pm UTC) or...

Get your hosting company to do it, ask them politely what they're doing re the issue. Make sure you run a backup and secure all you can. Basically, if you have any user data or banking details on there, you want to make sure to keep them safe. Smaller websites are likely safer, but do your best