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High

User Registration <= 2.3.2.1 - PHP Object Injection

  • Disclosed: 21.03.2023
  • Updated: 11.10.2026 10:22

The User Registration plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 2.3.2.1 via deserialization of untrusted input in the following functions: ur_get_user_extra_fields, user_registration_form_field. This allows subscriber-level attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

Affected software

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PlatformPackageVulnerable versionsFixed in
WordPress plugin User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder <= 2.3.2.1 2.3.3

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-502
Platform
WordPress
Package
User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder
Disclosed
21.03.2023
Updated
11.10.2026 10:22

Sources and licenses

Wordfence Intelligence - 5835fed0-5b9d-47b5-82ae-f0f19830ae2a - Wordfence Intelligence

Copyright 1999-2026 The MITRE Corporation

Copyright 2012-2026 Defiant Inc.

This record contains material that is subject to copyright

Copyright 1999-2026 The MITRE Corporation

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Copyright 2012-2026 Defiant Inc.

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/
Wordfence Intelligence
Wordfence Intelligence - Defiant, Inc.
Copyright Defiant, Inc. All rights reserved except as granted below.
License grant, section 3.1 of the Wordfence Intelligence Terms and Conditions (January 26, 2026):

Subject to this Agreement, Company hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Service. Any copy you make for such purposes is authorized provided that you reproduce Company’s copyright designation, this license, and the license of any disclosed Company licensor in any such copy.

Full applicable Agreement: https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/

Vulnerability history: User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder

All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (56) in the archive
Total entries
56
First → latest
01.2019 10.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 4
  • High 9
  • Medium 43

Disclosures per year

Severity:
  1. User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder < 5.2.8 - Unauthenticated Open Redirect
    High · 7.2 CVE-2026-80072 < 5.2.8 5.2.8
  2. User Registration & Membership <= 5.2.2 - Unauthenticated Privilege Escalation
    High · 8.1 CVE-2026-11961 <= 5.2.2 5.2.3
  3. User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder <= 4.4.9 - Unauthenticated Remote Code Execution
    Critical · 9.8 CVE-2026-32488 <= 4.4.9 5.1.3
  4. User Registration & Membership <= 5.1.2 - Unauthenticated Privilege Escalation via Membership Registration
    Critical · 9.8 CVE-2026-1492 <= 5.1.2 5.1.3
  5. User Registration & Membership <= 5.1.2 - Authentication Bypass
    High · 8.1 CVE-2026-1779 <= 5.1.2 5.1.3
  6. User Registration & Membership <= 4.1.2 - Authentication Bypass
    High · 8.1 CVE-2025-2594 <= 4.1.2 4.1.3
  7. User Registration & Membership <= 4.1.1 - Unauthenticated Privilege Escalation
    Critical · 9.8 CVE-2025-2563 <= 4.1.1 4.1.2
  8. User Registration – Custom Registration Form, Login Form, and User Profile WordPress Plugin <= 3.2.0.1 - Missing Authorization to Privilege Escalation
    High · 7.1 CVE-2024-4958 <= 3.2.0.1 3.2.1
  9. User Registration – Custom Registration Form, Login Form, and User Profile WordPress Plugin <= 3.1.5 - Missing Authorization to Authenticated (Subscriber+) Privilege Escalation
    High · 8.8 CVE-2024-2417 <= 3.1.5 3.2.0
  10. User Registration <= 3.0.2 - Authenticated (Subscriber+) Arbitrary File Upload
    Critical · 9.9 CVE-2023-3342 <= 3.0.2 3.0.2.1
  11. User Registration <= 3.0.1 - Authenticated (Subscriber+) PHP Object Injection
    High · 8.8 CVE-2023-3343 <= 3.0.1 3.0.2
  12. User Registration <= 2.3.2.1 - PHP Object Injection this entry
    High · 7.5 CVE-2023-27459 <= 2.3.2.1 2.3.3
  13. User Registration <= 2.2.4 - Authenticated (Subscriber+) Arbitrary File Upload
    High · 8.8 CVE-2022-3912 <= 2.2.4 2.2.41

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