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The advice runs the gamut. Change all of your passwords immediately. Don’t change any of your passwords immediately because they will just be immediately exposed. Personally, II would wait until I was sure the website I was going to change passwords on was fixed before doing so. You can make sure by going to https://www.ssllabs.com/ssltest/ and entering the URL you have a question about. It will test the site for vulnerabilities and give you the results.
I would monitor your bank account and credit cards for unusual charges. This really is a serious security issue that you should pay attention to.