Description
An issue was discovered in the Ultimate Member plugin before 2.1.12 for WordPress, aka Unauthenticated Privilege Escalation via User Meta. An attacker could supply an array parameter for sensitive metadata, such as the wp_capabilities user meta that defines a user's role. During the registration process, submitted registration details were passed to the update_profile function, and any metadata was accepted, e.g., wp_capabilities[administrator] for Administrator access.
Remediation
References
Related Vulnerabilities
Plone CMS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2013-7060)
Joomla! Core Multiple Vulnerabilities (1.5.0 - 3.7.2)
TYPO3 Files or Directories Accessible to External Parties Vulnerability (CVE-2021-21355)
Jenkins Improper Input Validation Vulnerability (CVE-2012-4438)
Squid Improper Input Validation Vulnerability (CVE-2016-2571)