Description

A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due to improper server-side validation. The application allows administrators to create "Loan Plans" with specific penalty rates for overdue payments. While the frontend interface prevents users from entering negative numbers in the "Monthly Overdue Penalty" field, this constraint is not enforced on the backend. An authenticated attacker can bypass the client-side restriction by manipulating the HTTP POST request to submit a negative value for the penalty_rate.

INFO

Published Date :

2026-04-01T00:00:00.000Z

Last Modified :

2026-04-01T15:37:44.224Z

Source :

mitre
AFFECTED PRODUCTS

The following products are affected by CVE-2026-30522 vulnerability.

Vendors Products
Oretnom23
  • Loan Management System
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-30522.

URL Resource
https://github.com/meifukun/Web-Security-PoCs/blob/main/Loan-Management-System/BusinessLogic-LoanPlan-NegativePenalty.md cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact