The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form_id' parameter in all versions up to, and including, 2.13.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload is stored in the registering user's 'submitted' usermeta via update_user_meta() and is only triggered when an administrator opens the affected user record in the wp-admin Users modal, which inserts the unescaped output via jQuery .html().
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
ultimatemember:ultimate member – user profile, registration, login, member directory, content restriction & membership plugin
References 8
https://github.com/ultimatemember/ultimatemember/releases/tag/2.14.0
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/5673f2b9-1c30-4ce0-8a…
security@wordfence.com