CVE-2026-15897
HighCVSS 8.8Summary
The Super Forms – Drag & Drop Form Builder plugin for WordPress (versions up to and including 6.3.316) is vulnerable to Privilege Escalation. The Register & Login add-on's before_email_success_msg() function in the register_login_action='update' flow trusts an attacker-supplied user_id value and passes it to wp_update_user() without any ownership or capability check. An authenticated attacker with Subscriber-level access can create a malicious form and submit it with an administrator's user_id and a new password/email, resulting in account takeover.
Risk Assessment
An attacker with low privileges can take over any account, including administrator, leading to full site compromise. The risk is critical because it only requires a subscriber account and can result in complete system compromise.
Recommendation
Update the Super Forms plugin to a version later than 6.3.316. Immediately verify administrator accounts for unauthorized changes and consider temporarily disabling the Register & Login add-on.
Other vulnerabilities in Super Forms
See all- CVE-2026-28167High
Unauthenticated arbitrary file download vulnerability in Super Forms versions up to 6.3.315.
- CVE-2026-15896Critical
The Super Forms – Drag & Drop Form Builder plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 6.3.316 via the parse_request function. This makes it possible for unauthenticated attackers to read the contents of arbitrary files on the server, which can contain sensitive information. The optional 'file_upload_auth' setting defaults to empty, meaning no authentication is required in the default configuration.
- CVE-2026-15989Critical
The Super Forms – Drag & Drop Form Builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 6.3.316. This is due to the Register & Login add-on's before_email_success_msg() function whitelisting the client-submitted 'role' key and copying it into the user-data array that is passed directly to wp_insert_user(), without validating the submitted role against the administrator-configured register_user_role, without an allow-list, and without any current_user_can() capability check. This makes it possible for unauthenticated attackers to register a new account with the Administrator role by injecting role=administrator into the data submitted to any published Super Forms registration form (register_login_action='register').
Original NVD description (English source)
The Super Forms – Drag & Drop Form Builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 6.3.316. This is due to the Register & Login add-on's before_email_success_msg() function, in its register_login_action='update' flow, trusting an attacker-supplied user_id value and passing it to wp_update_user() without any ownership or capability check. Because the super_save_form AJAX action also enforces no capability check, any authenticated user with Subscriber-level access and above can create the required malicious form (register_login_action='update' with register_login_user_id_update='true') and then submit it with user_id set to an administrator's ID along with a new user_pass/user_email. This makes it possible for authenticated attackers with Subscriber-level access and above to overwrite the credentials of arbitrary existing accounts — including administrators — resulting in account takeover and full site compromise.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS