Could you please help me in fixing following issue. I applied new patch supee-8788 this morning and it was installed successfully. I was able to flush the cache etc when I was already logged in to admin side.
I logged out then I could not login back to Magento admin side.
I am using Magento CE 126.96.36.199.
Hello. One of the reasons we have seen is when running on PHP version earlier than 5.6 it has error with missing function hash_equals. There is a compatible function for older versions in the patch but if you have custom functions.php file (either customized or changed by some extension), it will not apply. See below:
In case you have an app/code/local version of Mage/Core/functions.php you'll have issue with the new hash_equals function: http://magento.stackexchange.com/a/140664/2380
I am running 188.8.131.52 & php 5.4, but I do not have a core/functions. I am having the same problem of not being able to relog in. I reversed 8788 & still have issues. I do not follow your fix. Thanks