CVE-2024-56211: Userpro Authorization Bypass Vulnerability

CVE-2024-56211 Overview

CVE-2024-56211 is a Missing Authorization vulnerability [CWE-862] in the DeluxeThemes Userpro plugin for WordPress. The flaw affects Userpro versions up to and including 5.1.9. An authenticated attacker with low privileges can update arbitrary user meta values because the plugin fails to enforce proper capability checks on a sensitive action. Successful exploitation can lead to account takeover and privilege escalation to administrator, resulting in full compromise of the WordPress site.

Critical Impact

An authenticated attacker can modify arbitrary user meta and escalate to administrator, enabling full site takeover.

Affected Products

• DeluxeThemes Userpro plugin for WordPress
• All versions from n/a through 5.1.9
• WordPress sites using Userpro for user profile and registration management

Discovery Timeline

• 2024-12-31 - CVE-2024-56211 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-56211

Vulnerability Analysis

The Userpro plugin exposes a function that updates user meta data without verifying whether the requesting user has the authority to perform that update. WordPress user meta stores role-related fields such as wp_capabilities and wp_user_level. An authenticated user with any account, including a subscriber, can invoke the vulnerable action and modify user meta fields belonging to any user ID.

When an attacker rewrites their own capability fields, WordPress treats them as an administrator on subsequent requests. This provides complete control over content, plugins, themes, and other user accounts. The attacker can also overwrite meta on higher-privileged accounts to disable or hijack them.

Root Cause

The root cause is Missing Authorization [CWE-862]. The vulnerable endpoint does not call current_user_can() or an equivalent capability check before writing to usermeta. It also does not restrict the user_id or the meta_key parameters submitted in the request. Any authenticated session is sufficient to reach the code path.

Attack Vector

Exploitation requires network access to the WordPress site and a valid authenticated session with low privileges. The attacker sends a crafted HTTP request to the plugin's AJAX or form-handler endpoint that processes user meta updates. The request specifies a target user_id, a meta_key such as wp_capabilities, and a meta_value containing the desired serialized role array. No user interaction on the victim side is required. Consult the Patchstack Vulnerability Report for technical specifics on the vulnerable action.

Detection Methods for CVE-2024-56211

Indicators of Compromise

• Unexpected changes to wp_capabilities, wp_user_level, or session_tokens entries in the wp_usermeta table.
• Subscriber or contributor accounts that suddenly gain administrator role assignments.
• New administrator accounts created shortly after a low-privileged user logged in.
• POST requests to Userpro AJAX endpoints (admin-ajax.php with Userpro-specific actions) originating from low-privileged sessions.

Detection Strategies

• Audit the wp_usermeta table for role changes that do not correspond to legitimate administrator activity.
• Enable WordPress activity logging plugins to record role and meta modifications with source IP and user context.
• Correlate authenticated admin-ajax.php requests with subsequent privilege changes on the same or different user IDs.

Monitoring Recommendations

• Alert on any writes to wp_capabilities performed outside the standard WordPress admin user management flow.
• Monitor plugin update status and flag installations still running Userpro 5.1.9 or earlier.
• Track authentication events for accounts whose privileges change without a corresponding administrator action.

How to Mitigate CVE-2024-56211

Immediate Actions Required

• Update the DeluxeThemes Userpro plugin to a version later than 5.1.9 as soon as a patched release is available from the vendor.
• Audit all WordPress user accounts and remove unexpected administrator privileges.
• Reset passwords and invalidate active sessions for accounts whose meta was modified without authorization.
• Review recent plugin, theme, and file changes for signs of post-exploitation persistence.

Patch Information

Refer to the Patchstack Vulnerability Report for vendor patch status. If a vendor patch is not yet available, apply virtual patching via a Web Application Firewall to block requests targeting the vulnerable Userpro action.

Workarounds

• Deactivate and remove the Userpro plugin until a fixed version is installed if the plugin is not business-critical.
• Restrict access to admin-ajax.php and Userpro endpoints for unauthenticated and low-privileged users at the WAF layer.
• Enforce least privilege by limiting registration to roles that cannot invoke the vulnerable endpoint and by disabling open user registration where feasible.

# Example WAF rule (ModSecurity) to block Userpro meta-update abuse until patched
SecRule REQUEST_URI "@contains /wp-admin/admin-ajax.php" \
  "chain,phase:2,deny,status:403,id:1005621,msg:'Block Userpro CVE-2024-56211 exploit attempt'"
  SecRule ARGS:action "@rx ^userpro_" "chain"
    SecRule ARGS_NAMES "@rx (meta_key|user_id)" "t:none"