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Are there open databases, websites similar to xssed.com that are not necessarily about XSS, but where people report SQL inject-able websites or malware infected websites, for example?
Potentially with an Application Programming Interface (API)?
You are probably looking for xssposed.org, a successor website for xssed.com (actually they imported the old xssed database), and which was renamed to Open Bug Bounty a few months ago.
They list XSS and open redirects.
Required, but never shown