WordPress WP User Groups 2.0.0 Cross Site Request Forgery

`Details  
================  
Software: WP User Groups  
Version: 2.0.0  
Homepage: https://wordpress.org/plugins/wp-user-groups/  
Advisory report: https://advisories.dxw.com/advisories/csrf-wp-user-groups/  
CVE: Awaiting assignment  
CVSS: 4.3 (Medium; AV:N/AC:M/Au:N/C:N/I:P/A:N)  
  
Description  
================  
CSRF in WP User Groups allows anybody to modify user groups and types  
  
Vulnerability  
================  
WP User Groups creates new bulk actions to put users into (or remove them from) agroupsa and atypesa. A nonce is sent with the request, but it is not checked.  
  
Proof of concept  
================  
  
Activate the plugin  
Make sure you have a user with user_id=1  
Visit http://localhost/wp-admin/edit-tags.php?taxonomy=user-group and create a group called aCata with slug acata  
Visit http://localhost/wp-admin/users.php?users%5B%5D=1&action2=add-cat-user-group  
If you go back to http://localhost/wp-admin/users.php youall see the user with user_id=1 is now in the group aCata  
  
  
Mitigations  
================  
Upgrade to version 2.1.1 or later.  
  
Disclosure policy  
================  
dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: https://security.dxw.com/disclosure/  
  
Please contact us on [email protected] to acknowledge this report if you received it via a third party (for example, [email protected]) as they generally cannot communicate with us on your behalf.  
  
This vulnerability will be published if we do not receive a response to this report with 14 days.  
  
Timeline  
================  
  
2018-04-12: Discovered  
2018-04-16: Reported to plugin author via email  
2018-04-16: Vendor reported fixed in 2.1.1  
2018-05-11: Advisory published  
  
  
  
Discovered by dxw:  
================  
Tom Adams  
Please visit security.dxw.com for more information.  
  
  
  
  
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