This plugin allows the admin to reset all the passwords and automatically email out the link to reset

andy_moyle

This plugin does 3 things 
1) It will check you don’t have a username called “admin” which is asking to be hacked 
2) It will allow you to reset all passwords, with an password reset link sent to all users to warn them. 
Following a couple of reviews from v7.0 the plugin will allow you to set the email from address, name, subject and message 
3) You can also change the SALTS which forces a logout of all users.

Emergency password reset

Worked

This plugin does what it says on the tin. Works with multisite. Simply run it from the main blog in the network. Then delete it. 

Gotcha: it runs thorugh all users in a single request, so it may time out if your network has more than, say, 500 users.. Depending on your server env, you may not even see an error page, so you won't know which users were processed and which ones are pending.

Works on MS, may crash with many users

See support thread - it doesn't email out a working link. 

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