If you think you have found actual security issues you should report them via the Bug Bounty program. You can earn cash this way.
https://bugcrowd.com/ciscomeraki
You can also email the Cisco PSIRT team.
psirt@cisco.com
I've had a quick look at the pages. For the admin users, are you referring to the "secret" field? I don't know the format of this field. I'm going to guess it is a salted hash of some kind.
I can see the psk_passphrase field you refer to. It seems a funny place to have it on this page. Note you can retrieve this anyway from the Wireless/SSIDs.
I can't see any reason why it should be on this page - so you should report it to the Bug Bount program. I'm not sure you'll get a reward for this, since it is retrievable anyway, and I think it will get classified as minor.