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Date: Fri, 11 May 2018 19:33:54 +0000
From: dxw Security <>
Subject: [FD] CSRF in WP User Groups allows anybody to modify user groups
	and types (WordPress plugin)

Software: WP User Groups
Version: 2.0.0
Advisory report:
CVE: Awaiting assignment
CVSS: 4.3 (Medium; AV:N/AC:M/Au:N/C:N/I:P/A:N)

CSRF in WP User Groups allows anybody to modify user groups and types

WP User Groups creates new bulk actions to put users into (or remove them from) “groups” and “types”. 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 “Cat” with slug “cat”
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 you’ll see the user with user_id=1 is now in the group “Cat”

Upgrade to version 2.1.1 or later.

Disclosure policy
dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy:

Please contact us on to acknowledge this report if you received it via a third party (for example, 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.


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 for more information.

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