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not an error

Failed Login Attempt From Customer Log In Page Results In Blank Page

3 replies to this topic

#1 spencer



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Posted 14 July 2014 - 12:56 PM

When I try to log in using Exchange’s Customer Log In page with invalid username and/or password I end up on a blank page (literally nothing in the source). Unfortunately, I’m developing locally and can’t provide a URL. However, to recreate the issue:
  • Install WordPress 3.9.1 (leave all default settings)

  • Install iThemes Exchange 1.9.4 (no other plugins active)

  • Activate iThemes Exchange

  • Choose Offline Payments (must choose a payment method)

  • Log out of dashboard

  • Navigate to Customer Log In (/?account=1&log-in=1 because permalinks are still set to default)

  • Attempt invalid log in

  • End up at blank page (/wp-login.php?redirect_to=http%3A%2F%2Flocalhost%2F%3Faccount%3D1)
If after reaching the blank page you go back to the Customer Log In page and refresh, you will see the error messages stating the failed log in attempt.

#2 spencer



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Posted 14 July 2014 - 01:18 PM

It also looks like iThemes Exchange is causing wp-login.php to result in a blank page on failed log in attempts. If I disable Exchange, failed log in attempts to wp-login.php properly display error messages and run the "shake animation" of invalid input.

It appears that
add_filter( 'wp_login_errors', 'it_exchange_redirect_to_correct_login_form_on_error', 99 );
on line 1185 of lib/functions/functions.php is the culprit. Commenting it out fixes the blank page, but instead redirects the user to wp-login.php were WordPress' error messages are displayed instead.

In the it_exchange_redirect_to_correct_login_form_on_error function, the issue is that $wp_referer is empty and so is $exchange_pages[1] (the checkout page). Therefore, in_array( $wp_referer, $exchange_pages ) is true and so is $wp_referer == $exchange_pages[1]. Thus it_exchange_redirect( '', 'login-failed-from-' ) is called before die() causing the issue.

#3 spencer



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Posted 14 July 2014 - 03:55 PM

RESOLVED (needs to be actually marked resolved)

Turns out I had disabled sending HTTP-Referer headers in my browser causing wp_get_referer() to return empty.

#4 Elise Alley

Elise Alley

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Posted 14 July 2014 - 04:41 PM

Glad to hear it, Spencer!  I was testing it, but unable to replicate it, so I'm glad you found the issue.

Let us know if you have any additional questions.



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