CVE-2026-104748 — The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications…¶
Key facts
CVE-2026-104748 is a Critical (9.8) vulnerability: The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-104748 |
| Severity | Critical (9.8) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-104748/ |
Details¶
English | 한국어
Description¶
The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.10.0 This is due to the wp_ajax_nopriv_simpleform_wp_register AJAX action lacking any capability check for role assignment and the save_custom_fields_to_user_meta() function using an exclusion list that omits wp_capabilities, combined with get_form_settings() returning a hard-coded defaults array that unconditionally enables meta writing regardless of the supplied form_id. This makes it possible for unauthenticated attackers to create a new Administrator-level WordPress account by supplying wp_capabilities[administrator]=1 alongside standard registration fields. The nonce required by the endpoint is publicly emitted into the front_end_data JavaScript object on every front-end page via wp_enqueue_scripts, making it trivially obtainable by any unauthenticated visitor before submitting the malicious request.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-104748 |
| CVSS Score | 9.8 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-104748/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2026-104748
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- https://plugins.svn.wordpress.org/simple-form/trunk/
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.0/app/Assets.php#L265
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.0/app/Integrations/WordPressAuth.php#L184
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.0/app/Integrations/WordPressAuth.php#L291
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.0/app/Integrations/WordPressAuth.php#L32
- https://plugins.trac.wordpress.org/changeset/3726513/simple-form/trunk/app/Integrations/WordPressAuth.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/b2b973fe-1209-43dc-b2a3-74086b12fe97?source=cve
Generated by PoC Generator on 2026-10-14T18:19:09.641763995
Frequently asked questions¶
What is CVE-2026-104748?¶
CVE-2026-104748 is a Critical (9.8) vulnerability: The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-104748?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2026-104748?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
For authorized security testing and research only. See the full source and NVD record.