Listen to this Post
How CVE-2026-47198 Works
The vulnerability exists in Paymenter’s checkout component, specifically within the `app/Livewire/Products/Checkout.php` Livewire component. This component exposes the `$checkoutConfig` property to URL query parameters via the `
` attribute, aliased as <code>config</code>. When a user initiates a checkout, the system accepts key-value pairs from the URL's query string and processes them as configuration options for the server being provisioned.
The core issue lies in how these inputs are validated and stored. Paymenter's validation rules are dynamically generated only for keys explicitly defined by an extension's `getCheckoutConfig()` method. Any undefined keys injected into the query parameter bypass validation entirely, allowing an attacker to submit arbitrary configuration keys.
Once the input passes the checkout flow, the cart component (<code>app/Livewire/Cart.php</code>) stores all keys from the `checkout_config` array directly into the database without any sanitization or filtering:
[bash]
foreach ($item->checkout_config as $key => $value) {
$service->properties()->updateOrCreate(['key' => $key], ['value' => $value]);
}
During server provisioning, the `app/Helpers/ExtensionHelper.php` file retrieves these stored properties and passes them directly to the extension’s `createServer()` method. Because individual server extensions often prioritize user-supplied properties over administrator-defined configurations, an attacker can override critical hosting parameters such as CPU limits, RAM allocation, storage quotas, and package tiers.
This is a business logic flaw that allows remote, authenticated users to manipulate server provisioning parameters without requiring any administrative privileges. The attack is initiated by simply crafting a URL with the `config` parameter containing the desired key-value pairs, which are then persisted and applied during server creation.
DailyCVE Form
Platform: Paymenter
Version: prior to v1.5.1
Vulnerability: Improper Input Validation
Severity: Medium
Date: 2026-05-19
Prediction: Patched in v1.5.1
Analytics – What Undercode Say
The following commands and code snippets demonstrate the exploitation vector and the underlying logic flaw:
1. Crafting the Malicious URL
https://paymenter.example.com/checkout?config[bash]=8192&config[bash]=8&config[bash]=500
2. Database Storage Logic (Vulnerable Code)
// app/Livewire/Cart.php
foreach ($item->checkout_config as $key => $value) {
$service->properties()->updateOrCreate(['key' => $key], ['value' => $value]);
}
3. Server Provisioning Logic (Vulnerable Code)
// app/Helpers/ExtensionHelper.php
public function createServer(Service $service, $settings, $properties) {
// $properties contains user-supplied values from checkout_config
// Extensions merge these with admin settings, often prioritizing user values
$config = array_merge($settings, $properties);
// Server is provisioned with overridden parameters
}
4. Extension Example (Vulnerable Pattern)
// Example server extension
public function createServer(Service $service, $settings, $properties) {
// Vulnerable: user properties override admin settings
$ram = $properties['ram'] ?? $settings['ram'] ?? 1024;
$cpu = $properties['cpu'] ?? $settings['cpu'] ?? 1;
// Server created with user-controlled limits
}
Exploit
An authenticated attacker can exploit this vulnerability by:
- Initiating a checkout for any product that provisions a server.
- Modifying the URL to include the `config` query parameter with arbitrary key-value pairs, such as:
?config[bash]=8192&config[bash]=8&config[bash]=500
- Completing the checkout process. The injected values are stored in the database without validation.
- Upon server provisioning, the extension’s `createServer()` method receives these values and applies them, overriding the administrator’s intended resource limits.
No special privileges are required—any authenticated user can perform this attack.
Protection
To mitigate CVE-2026-47198, the following measures should be implemented:
1. Upgrade to Paymenter v1.5.1 or later, which includes a patch that properly validates and sanitizes `checkout_config` inputs.
2. Implement strict input validation for all keys accepted via the `[bash]` attribute, ensuring only whitelisted keys are processed.
3. Sanitize database writes by filtering `checkout_config` data before storing it in the `service_properties` table.
4. Enforce administrator precedence in server extensions by using `array_merge($properties, $settings)` instead of array_merge($settings, $properties), ensuring admin settings always override user-supplied values.
5. Apply the principle of least privilege by restricting which properties can be modified via URL parameters and requiring administrative approval for any resource limit changes.
Impact
Successful exploitation of this vulnerability allows an authenticated attacker to:
– Override core server resource limits, including CPU, RAM, storage, and package tiers.
– Provision servers with resources that exceed the purchased plan, leading to financial loss for the hosting provider.
– Bypass business logic restrictions and gain unauthorized access to higher-tier resources.
– Potentially cause denial of service by over-provisioning resources across multiple servers.
The vulnerability affects all Paymenter installations prior to version 1.5.1 and requires no administrative privileges, making it a critical business logic flaw with significant financial and operational implications.
🎯Let’s Practice Exploiting & Learn Patching For Free:
🎓 Live Courses & Certifications:
Join Undercode Academy for Verified Certifications
🚀 Request a Custom Project:
Secure, high-velocity infrastructure and disruptive technological engineering. Contact our engineering team for high-tier development and proprietary systems:
[email protected]
💎 Smart Architecture | 🛡️ Secure by Design | ⭐ Trusted by Thousands
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
