User Registration & Membership <= 5.1.0 - Unauthenticated Payment Bypass
Strategic Overview
- Status
- Patched in 5.2.0
- Affected Version
<= 5.1.0- CVSS
- 5.3Medium
- Weakness type
- CWE-602 · Client-Side Enforcement of Server-Side Security
- CVE
CVE-2026-11965
At a glance
CVE-2026-11965 is a medium-severity Client-Side Enforcement of Server-Side Security vulnerability in the User Registration & Membership WordPress plugin, affecting versions <= 5.1.0. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 5.2.0; sites on affected versions should update now. Disclosed June 2026, reported by John Umoru.
Vulnerability Overview
The User Registration & Membership plugin for WordPress is vulnerable to Payment Bypass in versions up to, and including, 5.1.0. This is due to a lack of server-side payment verification. This makes it possible for unauthenticated attackers to bypass payments.
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 privileges on the target site, and no interaction from a victim user.
CWE-602: Client-Side Enforcement of Server-Side Security
The product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server.
Remediation
Update to version 5.2.0, or a newer patched version
How does WordSec protect against this?
This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: User Registration & Membership 5.2.0 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder
- 9.9CVE-2023-3342: User Registration <= 3.0.2 Arbitrary File Upload
CVE-2023-3342 - 9.8CVE-2026-32488: User Registration & Membership RCE
CVE-2026-32488 - 9.8CVE-2026-1492: User Registration & Membership Privilege Escalation
CVE-2026-1492 - 9.8CVE-2025-2563: User Registration & Membership Privilege Escalation
CVE-2025-2563 - 8.8CVE-2024-2417: User Registration Authenticated (Subscriber+)
CVE-2024-2417 - 8.8CVE-2023-3343: User Registration <= 3.0.1 PHP Object Injection
CVE-2023-3343 - 8.8CVE-2022-3912: User Registration <= 2.2.4 Arbitrary File Upload
CVE-2022-3912 - 8.1CVE-2026-11961: User Registration & Membership Privilege Escalation
CVE-2026-11961
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