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Re:Ask HN: How long to give a website to fix their security ... by maushu on Friday October 22, 2010 @10:18AM (#1819761)
Send a high priority email to their customer support (or alike), wait 24 hours, if no response is received then tell the customers (blog post? forum thread? hnews/reddit?).

If response is received wait a week or so and, again, check for the existence of the exploit.

Re:Ask HN: How long to give a website to fix their security ... by lmai on Friday October 22, 2010 @01:11PM (#1820462)
Thanks. I was thinking giving them the weekend.