CVE-2026-47198 Overview
Paymenter is a free and open-source webshop platform used to manage hosting services. CVE-2026-47198 affects Paymenter versions prior to 1.5.1. The flaw resides in the checkout Livewire component, which improperly filters URL-writable properties on the $checkoutConfig object. Authenticated users can inject arbitrary key-value pairs into server provisioning parameters through URL query strings. Because bundled server extensions prioritize user-supplied properties over administrator-defined configurations, a regular customer can override hosting plan tiers and resource limits at checkout. The vulnerability is tracked under [CWE-20] Improper Input Validation and was fixed in version 1.5.1.
Critical Impact
Authenticated users can override administrator-defined CPU, RAM, storage, and package tier limits during checkout without any privilege escalation.
Affected Products
- Paymenter versions prior to 1.5.1
- Deployments using bundled server extensions that consume $checkoutConfig properties
- Hosting provisioning workflows dependent on administrator-defined plan configurations
Discovery Timeline
- 2026-07-20 - CVE-2026-47198 published to NVD
- 2026-07-23 - Last updated in NVD database
Technical Details for CVE-2026-47198
Vulnerability Analysis
The Checkout Livewire component in Paymenter exposes its $checkoutConfig property through URL query parameters. Livewire binds these query parameters directly to the component state during checkout. The validation logic only checks keys explicitly defined by an extension's configuration method. Any key not enumerated by the extension bypasses validation entirely and is accepted as-is.
The unvalidated keys flow from the URL into the cart component, which persists them in the database. During provisioning, the server extension reads these attacker-controlled values and applies them ahead of administrator-defined defaults. The attacker gains the ability to redefine resource ceilings that should be immutable from the customer perspective.
Exploitation requires only a valid authenticated session. No administrative role, elevated privilege, or bypass of authentication is needed. The scope change reflects that the checkout component can influence downstream provisioning systems beyond its own security boundary.
Root Cause
The root cause is an allow-by-default input handling pattern in the Livewire $checkoutConfig property. Instead of rejecting undefined keys, the component silently accepts them and forwards them to server extensions. This is a classic [CWE-20] Improper Input Validation flaw compounded by a design assumption that extensions define an exhaustive allowlist.
Attack Vector
An authenticated attacker crafts a checkout URL that appends extra query parameters mapped to $checkoutConfig. Injected keys such as CPU cores, memory, disk quota, or plan identifier override administrator-defined values. The cart stores the tampered configuration, and the provisioning routine deploys the elevated resources on the hosting backend. See the GitHub Security Advisory for the vendor's technical description.
Detection Methods for CVE-2026-47198
Indicators of Compromise
- Checkout requests containing query parameters not defined in the active server extension's configuration schema
- Provisioned services with resource allocations that exceed the purchased plan's advertised limits
- Database entries in the cart or orders table containing configuration keys inconsistent with the plan definition
- Anomalous divergence between administrator-defined plan tiers and provisioned hosting resources
Detection Strategies
- Compare provisioned resource allocations against catalog plan definitions and flag mismatches
- Log all URL query parameters received by the Checkout Livewire component and alert on unknown keys
- Review server extension provisioning logs for override events applied after order submission
- Audit historical orders in versions prior to 1.5.1 for injected configuration keys
Monitoring Recommendations
- Enable verbose logging on checkout and provisioning endpoints to capture full parameter payloads
- Baseline the set of legitimate $checkoutConfig keys per extension and alert on deviations
- Monitor hosting backend APIs for provisioning calls that request atypical resource tiers
How to Mitigate CVE-2026-47198
Immediate Actions Required
- Upgrade all Paymenter deployments to version 1.5.1 or later without delay
- Audit recent orders and provisioned services for configuration values that exceed purchased plan limits
- Reconcile hosting backend resource allocations against the Paymenter order database
- Revoke or reprovision any hosting instance found to contain injected configuration overrides
Patch Information
The vulnerability is fixed in Paymenter version 1.5.1. The patch corrects the Checkout Livewire component to reject configuration keys that are not explicitly declared by the active server extension. Refer to the GitHub Security Advisory GHSA-5q4q-834j-g8g4 for release details.
Workarounds
- If immediate upgrade is not possible, disable public checkout for affected server extensions until patching
- Apply a reverse proxy or web application firewall rule to strip unknown query parameters from checkout URLs
- Restrict checkout access to trusted user segments while validating orders manually before provisioning
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
