How not to suck at data validation and output: Security is an important aspect of web application development. In this talk we’ll have a look at the most common data input and output mistakes and what you as a developer can do to prevent them. We’ll have a look at methods and ways Magento 1 and 2 provide to increase security.

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I'm highly guilty of having done so many of the shortcuts raised here, and we all need to tighten up how we code for security while we're coding it rather than relying on slapping security on afterwards.

I saw the talk for the second time and it's still good! A must-watch for every developer as a reminder to secure input and output with practical tips for Magento 2

Really interesting talk about correctly validating your user inputs (and your output)