I have installed the 5994 patch on three of my websites. One use version 22.214.171.124 , and other two(A & B) use 126.96.36.199.
After installing, the version 1.8 is all right. But there is a big problem on the other two 1.7 websites. The frontend are both ok on two websites. But when I click 'orders' and 'manage products' in the admin, both pages of A got the 404 error. The most strange thing is that I can visit the 'orders' page of B. 'manage products' still got 404 error. A&B has the same configuration and same extension installed.
I tried to revert the patch, but both frontend and admin became blank after I did that. I have to patch it again.
Can someone help?
If you're using third party modules from developers that kind of missed using proper security programming practices, that can happen (404 not found) in the admin backend when you access anything the module has modified after installing SUPEE-5994. Time to demand a module update from the developer.
So I need to download the original version of 188.8.131.52 and make a comparison. Find the third party modules and test. Am I right?