The information I found in here are just outdated. I would like to find is there any accurate document listed out all the patch required for the WannaCry.
So a couple of points:
1 - It'd help if you'd list "the documentation you found that is outdated", so it can be reviewed, if at all needed.
2 - WannaCry's vulnerability is a mite more complicated because of how Microsoft is patching now. SOME monthly rollups do include the relevant fix, while others do not. Would suggest you read up on it a little, useful to understand the background.
3 - The common articles on WannaCry are usually these:
4 - These articles will help you with the reporting side of things - note the last one, which specifically highlights the fact that we've released a vulnerability to help with the "tracing the sucker down" side of things, since the patch is a bit more of a convoluted affair (as I alluded to in point 2).
... plenty of information here. Should be more than enough.