CVE-2026-15451: MemberPress Corporate Accounts <= 1.5.39 - Authenticated (Subscriber+) Privilege Escalation via Mass Assignment in Sub-Account Creation
The MemberPress Corporate Accounts plugin for WordPress is vulnerable to Privilege Escalation in versions up to, and including, 1.5.39. This is due to a mass assignment vulnerability in the 'addsubaccountuser' function that passes the raw 'userdata' array to 'wpinsertuser' without filtering dangerous keys like role or ID. This makes it possible for authenticated attackers, with subscriber-level access and above who hold a corporate account, to create new administrator accounts or hijack existing administrator accounts by overwriting their email addresses. The vulnerability was partially patched in version 1.5.39.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker must be authenticated at subscriber level or higher and must hold a corporate account. Unauthenticated visitors are not described as able to exploit it.
What could an attacker do after exploiting it?
They could create a new WordPress administrator account or take over an existing administrator account by changing its email address. This can result in full compromise of confidentiality, integrity, and availability.
Is version 1.5.39 fully fixed?
No. The issue is described as only partially patched in version 1.5.39, so deployments at or below that version should be treated as affected.
What should be checked for signs of exploitation?
Review WordPress user accounts for unexpected administrator accounts and inspect administrator email addresses for unauthorized changes. Also review sub-account creation activity associated with corporate accounts, particularly accounts held by subscriber-level users.