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Have to deal with some incorrectly assigned/redirected posts from an HTTPS server to HTTP URL's. How much of a security risk are these? Are they vulnerable to something like a man-in-the-middle attack?

  • What do you mean? If you're sending a POST over HTTPS, how could it suddenly transform into HTTP? Where is this HTTP transfer taking place? Do you have a form with a HTTP target URL? – gparent Dec 18 '14 at 22:16
  • BTW, a redirected POST ceases to be one - it'll come through as a GET without the form data. – ceejayoz Dec 18 '14 at 22:22
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<form action="http://example.com/"> would post data insecurely, even if the page the <form> is on is itself HTTPS. Data sent in this manner can be intercepted / MITMed.

For the same reasons, <form action="https://example.com/"> on a HTTP page is sent securely. However, the page the <form> is hosted on in this situation can itself be MITMed to inject malicious JavaScript or a changed action that could send the data elsewhere.

If you're working with sensitive data, both the page with the form and the form action need to be HTTPS.

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