XSS in a certificate signing request

Web application developers will all know, never to trust the input of the users of the web application. But what if you do not really know what they are submitting?

While investigating some form fields in our application, I came across a form for checking a certificate signing request (CSR) which you need to order a SSL / TLS certificate.

A certificate signing request is an encoded file with the information to request a certificate from a certificate authority (CA) or a reseller of that CA. You will need to create that file yourself and put in the information that you want.

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