MemberPress Corporate Accounts <= 1.5.39 - Authenticated (Subscriber+) Privilege Escalation via Mass Assignment in Sub-Account Creation
Strategic Overview
- Status
- Patched in 1.6.0
- Affected Plugin
- MemberPress Corporate Accounts
- Affected Version
<= 1.5.39- CVSS
- 8.8High
- Weakness type
- CWE-269 · Improper Privilege Management
- CVE
CVE-2026-15451
At a glance
CVE-2026-15451 is a high-severity Improper Privilege Management vulnerability in the MemberPress Corporate Accounts WordPress plugin, affecting versions <= 1.5.39. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 1.6.0; sites on affected versions should update now. Disclosed September 2026, reported by andrea bocchetti.
Vulnerability Overview
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 'add_sub_account_user' function that passes the raw 'userdata' array to 'wp_insert_user' 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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-269: Improper Privilege Management
MemberPress Corporate Accounts <= 1.5.39 carries this weakness at add_sub_account_user, and reaching it takes an account at Subscriber level or above. Improper privilege management means the code lets an account end up with capabilities its role should not have.
It converts a low-privileged account into an administrative one, which makes every other restriction on the site irrelevant. For MemberPress Corporate Accounts the fix is 1.6.0: builds <= 1.5.39 are affected, anything from 1.6.0 onward is not.
Remediation
Update to version 1.6.0, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: MemberPress Corporate Accounts 1.6.0 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
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