CVE-2026-30521 — MEDIUM (6.5)

Vulnerability Description

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.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Oretnom23	Loan Management System	1.0

Related Weaknesses (CWE)

CWE-602

References

https://github.com/meifukun/Web-Security-PoCs/blob/main/Loan-Management-System/BExploitThird Party Advisory

FAQ

What is CVE-2026-30521?

CVE-2026-30521 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 i...

How severe is CVE-2026-30521?

CVE-2026-30521 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-30521?

Check the references section above for vendor advisories and patch information. Affected products include: Oretnom23 Loan Management System.