I have the same question. I implemented this fix after encountering the problem and am concerned if this compromises the security.
+1 too. Got a VPS on standby waiting for the guide :-) I could try on my own but would rather wait.
Same problem updating manually from 3.0.5.4p3 I am encountering the same problem manually updating from 3.0.5.4p3 on two different servers, two...
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