Business Logic Flaw in SourceCodester Loan Management System
CVE-2026-30522

6.5MEDIUM

Key Information:

Vendor

SourceCodester
Status
Loan Management System
Vendor
CVE Published:
1 April 2026

What is CVE-2026-30522?

A business logic flaw has been identified in the SourceCodester Loan Management System v1.0 stemming from improper server-side validation. While the application restricts users from entering negative values in the 'Monthly Overdue Penalty' field on the frontend, this restriction does not extend to the backend. As a result, an authenticated attacker can exploit this vulnerability by manipulating HTTP POST requests to input negative values for penalty rates, potentially leading to unintended financial consequences.

References

https://github.com/meifukun/Web-Security-PoCs/blob/main/L...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.