EUVD-2026-17895
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
4Description
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.
Analysis
SourceCodester Loan Management System v1.0 allows authenticated administrators to submit negative penalty rates for loan overdue payments by bypassing client-side validation through direct HTTP POST manipulation, enabling financial fraud through reversed penalty calculations that benefit borrowers instead of lenders. The vulnerability requires authenticated access but no CVSS score, EPSS probability, or formal patch status is available; however, publicly available exploit code confirms the vulnerability's technical feasibility.
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