Meta Box Frontend Submission
Monthly
Unauthenticated privilege escalation to WordPress Administrator in the Meta Box AIO plugin (versions up to and including 3.11.0) - and in the standalone Meta Box Frontend Submission (≤4.5.6) and Meta Box User Profile (≤3.11.0) plugins - lets remote attackers rewrite the post_content of any page with an attacker-supplied shortcode and then create a new administrative account. The exploit chains three defects: populate_via_query_string() in mb-frontend-submission unconditionally overrides the form's target object_id from the rwmb_frontend_field_object_id GET parameter, Form::process() omits the user_can_edit() check that render() enforces, and mb-user-profile trusts the role and auto_login attributes of an injected [mb_user_profile_register] shortcode without validating the requested role. The flaw is network-reachable with PR:N/UI:N per the assessed CVSS 3.1 vector (9.8), so no authentication, user interaction, or prior privileges are required; Wordfence disclosed the issue, publicly available exploit code has not been identified at time of analysis, and there is no CISA KEV confirmation of active exploitation. The practical exposure limiter is deployment-specific: the site must expose a Meta Box frontend-submission form and must process the mb-user-profile registration component for the escalation to complete.
Unauthenticated privilege escalation to WordPress Administrator in the Meta Box AIO plugin (versions up to and including 3.11.0) - and in the standalone Meta Box Frontend Submission (≤4.5.6) and Meta Box User Profile (≤3.11.0) plugins - lets remote attackers rewrite the post_content of any page with an attacker-supplied shortcode and then create a new administrative account. The exploit chains three defects: populate_via_query_string() in mb-frontend-submission unconditionally overrides the form's target object_id from the rwmb_frontend_field_object_id GET parameter, Form::process() omits the user_can_edit() check that render() enforces, and mb-user-profile trusts the role and auto_login attributes of an injected [mb_user_profile_register] shortcode without validating the requested role. The flaw is network-reachable with PR:N/UI:N per the assessed CVSS 3.1 vector (9.8), so no authentication, user interaction, or prior privileges are required; Wordfence disclosed the issue, publicly available exploit code has not been identified at time of analysis, and there is no CISA KEV confirmation of active exploitation. The practical exposure limiter is deployment-specific: the site must expose a Meta Box frontend-submission form and must process the mb-user-profile registration component for the escalation to complete.