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Discussion on: Send e-mails directly from front-end with JavaScript 💥💥

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mikenikles profile image
Mike Nikles

I'm curious to understand the security of this solution. If I visit your site, could I not take your USER_ID and send emails on your behalf?

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veebuv profile image
Vaibhav Namburi

I believe a solution like this would work due to domain restrictions. I.e you can take the keys and user ID, but can only send/activate the service if the domain matches

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franky47 profile image
François Best • Edited

You could probably use that USER_ID from the devtools console of the appropriate domain and send whatever you want, impersonating the domain owner.

Edit: the FAQ of the service indicates you can only send predefined template emails, but template variable injection could be abused.

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mikenikles profile image
Mike Nikles

Yeah that's somewhat a relief 😅. As a bad actor, I could still send thousands of messages, potentially causing increased cost or worse, the email account getting blocked.

This service seems convenient at first, but with today's serverless solutions it's worth building a backend solution that is properly secured.

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xr0master profile image
Sergey Khomushin

There is no way you can solve this problem by creating your solution. As a bad guy, I can just as well call your API for your form.

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iwaniukooo11 profile image
Mateusz Iwaniuk Author

Hi, at first I want to thank you all for taking part in discussion.
In my project I have used webpack and gulp thanks to what finished JS code is bundled and minified, which makes searching IDs harder.
Problems with visible of API is not a problem of this package, but of the entire front-end. Even when you want to fetch f.e Pizza API, you might be obliged to pass your private key, which later will be visible in dev tools.
In my article I have bundled and minified code which is in seperated file. It is still more safer than keeping everything in HTML file, what was shown on this documentation part

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patricnox profile image
PatricNox

Very true. An OAuth token should always be used in these API scenarios which does more than only being used for a getter.

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xr0master profile image
Sergey Khomushin

What prevents from calling the API using an access token (from OAuth)?