Isolating the problem (mark completed items with an [x]):
I have deactivated other plugins and confirmed this bug occurs when only Ultimate Member plugin is active.
This bug happens with a default WordPress theme active, or UM Theme.
I can reproduce this bug consistently using the steps above.
Describe the bug
URL redirection issue in some components. @ can be used to bypass the content detection of these components. For example enter a link https://facebook.com@www.example.com into the Facebook field. After updating the profile, the URL is redirected to http://www.example.com. Attackers can redirect these urls to their phishing sites.
Considering the domain of wordpress is http://www.example.com and there are two people: Alice and Bob. Alice is an attacker and Bob is a normal user. If the logout page is http://www.example.com/logout, Alice puts this URL into the "Website URL" component or puts https://facebook.com@www.example.com/logout into the "Facebook" component. Then when Bob clicks Alice's Website URL or Facebook link, he will turn to logout and log out the system. The operation of logging out may not cause security issues. However, if the operation is sensitive, it may cause serious security problems.
Expected behavior
Validate social links. Disallow the Logout URL.
Screenshots
Image 01 - Edit mode
Image 02 - View mode
Image 03 - Edit mode
Image 04 - View mode
The text was updated successfully, but these errors were encountered:
Isolating the problem (mark completed items with an [x]):
Describe the bug
Expected behavior
Validate social links. Disallow the Logout URL.
Screenshots

Image 01 - Edit mode
Image 02 - View mode

Image 03 - Edit mode

Image 04 - View mode

The text was updated successfully, but these errors were encountered: