User Registration & Membership <= 5.2.1 - Authenticated (Subscriber+) Insecure Direct Object Reference to Membership Tier Modification

2026-06-22 00:00

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

CVSS4.3Medium

CVECVE-2026-11963

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 Insecure Direct Object Reference in all versions up to, and including, 5.2.1 due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Subscriber-level access and above, to register as other membership tiers.

Technical Analysis

REMEDIATION: Update to version 5.2.2, or a newer patched version --- IDENTIFIER: CWE-639 (Authorization Bypass Through User-Controlled Key) The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

External References

https://www.cve.org/CVERecord?id=CVE-2026-11963 https://www.wordfence.com/threat-intel/vulnerabilities/id/f36b3571-1dc1-4c2f-8888-5fd823ce1954

CVSS Vector

4.3

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

Base

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

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