Plaid is an evil nightmare product from Security Hell


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Plaid is a business that has built a widget that can be embedded in any of their customer’s websites which allows their customers to configure integrations with a list of third-party service providers. To facilitate this, Plaid pops up a widget on their customer’s domain which asks the end-user to type in their username and password for the third-party service provider. If necessary, they will ask for a 2FA code. This is done without the third party’s permission, presumably through a browser emulator and a provider-specific munging shim, and collects the user’s credentials on a domain which is operated by neither the third party nor by Plaid.
The third-party service provider in question is the end-user’s bank.
What the actual fuck!
Plaid has weighed on my mind for a while, though I might have just ignored them if they hadn’t been enjoying a sharp rise in adoption across the industry. For decades, we have stressed the importance of double-checking the domain name and the little TLS “lock” icon before entering your account details for anything. It is perhaps the single most important piece of advice the digital security community has tried to bring into the public conciousness. Plaid wants to throw out all of those years of hard work and ask users to enter their freaking bank credentials into a third-party form.
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