CVE-2026-30521

A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due to improper server-side validation

Medium · published March 31, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
32.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00392 · 32.2th percentile
Published
2026-03-31T00:00Z
EPSS history
Timeline
  • 31 MAR 00:00Z
    A Business Logic vulnerability exists in SourceCodester Loan Management System v1.0 due to improper server-side validation
    cvelistv5