CVE-2026-30521
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk24th percentile - higher than 24% of all known CVEs
Summary
In SourceCodester Loan Management System v1.0, there is a business logic vulnerability due to missing server-side validation. An authenticated attacker can bypass frontend restrictions and submit a negative value for the interest_percentage field, creating loan plans with negative interest rates.
Risk Assessment
The organization risks manipulation of loan terms, which could lead to financial losses or system malfunction.
Recommendation
Implement server-side validation for all numeric fields, especially interest_percentage, to reject negative values.
Original NVD description (English source)
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 interest rates. While the frontend interface prevents users from entering negative numbers, 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 interest_percentage. This results in the creation of loan plans with negative interest rates.