Before anyone ask why: the WAN port is connected to the companies LAN network.
that somehow it's accessable and how to stop it.
I want to open it up for access. How do I do that?
search is your friend: google this phrase and you'll see many threads about this specific topic: "OpenWrt luci from wan"
Since you have stated that the OpenWrt WAN is connected to a LAN -- and as long as that LAN is trusted -- you should be fine. The threads you find will include warnings that you should read/consider if there is anything untrusted on the upstream network.
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