What is CVE-2026-30521?

CVE-2026-30521 is a medium-severity vulnerability in Oretnom23 Loan Management System, classified under CWE-602. CVSS score: 6.5/10. Published 2026-03-31.

How severe is CVE-2026-30521?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Oretnom23 Loan Management System

CVE-2026-30521

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.

EPSS: 0.003 (23.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Oretnom23 Loan_management_system — versions 1.0
N/a — versions n/a

Weakness classification (CWE)

CWE-602

References

cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-30521?: CVE-2026-30521 is a medium-severity vulnerability in Oretnom23 Loan Management System, classified under CWE-602. CVSS score: 6.5/10. Published 2026-03-31.
How severe is CVE-2026-30521?: Medium severity. CVSS v3 base score is 6.5 out of 10.