SQL Injection Vulnerability in User Registration Plugin for WordPress
CVE-2026-1865

6.5MEDIUM

Key Information:

Vendor

WordPress
Status
User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder
Vendor
CVE Published:
8 April 2026

What is CVE-2026-1865?

The User Registration & Membership plugin for WordPress is susceptible to SQL Injection via the 'membership_ids[]' parameter. This vulnerability arises from inadequate input escaping for user-supplied parameters, allowing authenticated attackers with Subscriber-level access or higher to insert malicious SQL queries into existing ones. Consequently, this may enable attackers to extract sensitive information from the database, posing a significant risk to user data privacy and application integrity.

Affected Version(s)

User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder 0 <= 5.1.2

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/changeset/3469042/user...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Athiwat Tiprasaharn
Itthidej Aramsri
.