Horizon Alert
Summary of the vulnerability and why it matters
A critical vulnerability in the User Profile Builder WordPress plugin allows unauthenticated attackers to bypass authentication and gain full administrative control of a website. This occurs due to how the plugin handles user registration errors, enabling an attacker to impersonate the site administrator.
- Bypasses website login for full control.
- Affects public-facing WordPress sites.
- Confirm relevance and exposure of the plugin.
Attack Path
How an attacker could exploit the issue
An attacker can bypass authentication by exploiting a flaw in how the User Profile Builder plugin handles user registration. By submitting a username of a specific length, the attacker can trick the plugin into issuing a login token for the administrator account, granting them full control of the WordPress site without needing any prior access or credentials.
- Unauthenticated attackers can reach the vulnerable function.
- A registration with a specific username length triggers the flaw.
- Full administrative takeover of the site is the resulting risk.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability in the User Profile Builder plugin could allow an unauthenticated attacker to bypass authentication and log in as the site's administrator. This is possible when a username of a specific length is submitted during registration, causing the plugin to improperly handle an error and grant an administrator login token to the attacker.
- User administrator account.
- Unauthenticated users can bypass authentication.
- Full administrative takeover of the site.
Operational Fix
Recommended remediation, mitigation, and detection steps
This critical vulnerability in the User Profile Builder plugin for WordPress requires immediate attention from the platform or application owners responsible for managing WordPress instances. The first step is to identify all affected WordPress sites, confirm their internet reachability and business criticality, and then assign ownership for remediation.
- Application owners should prioritize remediation.
- Verify all WordPress sites using the plugin.
- Plan for plugin update or removal.
