Use Admin Password

This plugin allows you to log in as any user, using any administrator’s password. The user can still log in using their own password.

Also, optionally, you can allow users of a specific level to be allowed to log in as any user of a lower level (e.g. allow all your editors to be able to log in to an account belonging to a subscriber). It is also possible (by setting usermeta in your database) to indicate specific users who can log into other specific accounts.

This plugin is also compatible with https://wordpress.org/plugins/two-factor-authentication/ – if TFA is enabled on an account, then the TFA credentials required are those of the user whose credentials are used (in this case, that user is required to also have TFA enabled).

License

Copyright 2012- David Anderson

MIT License:

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.