CVE-2018-14020: Paymorrow Improper Input Validation vulnerability

The provided vulnerability descriptions indicate a logic flaw in how the Paymorrow module interacts with OXID eShop's checkout procedure, but no specific function names or code patterns are disclosed in the available references. The core issue appears to be a missing validation step when handling delivery address changes, potentially in payment processing workflows. However, without access to the original codebase, patch diffs, or explicit documentation of affected functions (which are not present in GHSA/NVD descriptions), we cannot confidently identify specific vulnerable functions. The vulnerability stems from architectural integration flaws rather than isolated function-level weaknesses.