User Registration & Membership <= 5.2.1 - Unauthenticated PayPal Bypass to Membership Activation

2026-06-22 00:00

Alessandro Greco aka Aleff, Giovanbattista Ianni (University of Calabria - UNICAL)

Strategic Overview

Status

Patched in 5.2.2

Affected PluginUser Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder

Affected Version<= 5.2.1

CVSS5.3Medium

CVECVE-2026-11964

View all User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder vulnerabilities

Vulnerability Overview

The User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder plugin for WordPress is vulnerable to payment bypass in all versions up to, and including, 5.2.1. This makes it possible for unauthenticated attackers to activate their membership without fully completing a payment.

Technical Analysis

REMEDIATION: Update to version 5.2.2, or a newer patched version --- IDENTIFIER: CWE-287 (Improper Authentication) When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

External References

https://www.cve.org/CVERecord?id=CVE-2026-11964 https://www.wordfence.com/threat-intel/vulnerabilities/id/cfa6bc4b-7fc8-40c7-bfca-18410f6cd615

CVSS Vector

5.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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