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CVE-2026-19652 – Unauthenticated Privilege Escalation to Admin – Divi Membership WordPress Plugin (≤

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Summary

CVE-2026-19652 is a critical privilege escalation vulnerability in the Divi Membership WordPress plugin, affecting all versions up to and including 2.2.0. The flaw allows a completely unauthenticated attacker to register a new WordPress account with the administrator role and be automatically logged in, resulting in full site takeover. The issue carries the maximum practical severity rating of CVSS 9.8 (Critical).

Technical details

  • Root cause: The plugin’s dmem_form_submit_handler() function determines the role assigned to a newly registered user by iterating over every WordPress role and calling password_verify() against an attacker-supplied bcrypt hash passed in the form_id POST parameter, with no whitelist or validation restricting which roles can be assigned.
  • Trigger conditions: An attacker submits a registration request to the plugin’s form handler with a locally computed bcrypt hash of the string administrator as the form_id value. A WordPress nonce is required, but it is publicly emitted on any page that renders the Divi Membership registration form, so it is trivially obtainable by any site visitor without authentication.
  • Attack vector: Network — the request is a standard unauthenticated HTTP POST to the plugin’s registration endpoint; no prior access or user interaction is required.
  • Impact: When the request additionally includes auto_login=on, the attacker is immediately authenticated as the newly created administrator account in the same request, yielding full confidentiality, integrity, and availability impact on the affected WordPress site (CWE-269: Improper Privilege Management).

Affected software

  • Divi Membership (DiviEngine) WordPress plugin — all versions up to and including 2.2.0

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update Divi Membership to version 3.0.0 or later, which addresses this issue.
  • If immediate patching is not possible: Restrict or disable public access to the plugin’s registration/membership forms, monitor for unexpected new administrator account creation, and review existing user accounts for unauthorized administrator-role users. Consider placing a web application firewall rule in front of the registration endpoint to block POST requests containing unexpected form_id values until the plugin can be updated.

References

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