Hi there, I am actually facing similar issue, some links cause redirect loop to admin after update to WP 4.9.5. I have not done any other change today, just updated WP version.
Update: I just found solution, wp-login.php file of 4.9.5 version is an issue, copy wp-login.php from 4.9.4 (https://ww.wp.xz.cn/download/release-archive/) and you should be fine;-)
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This reply was modified 8 years, 2 months ago by lukasklokan.
Michael, thank you for your response. Issue is now resolved, it was actually related to theme I was using.
