SourceCodester Loan Management System 1.0 Frontend Interface interest_percentage logic error

Summaryinfo

A vulnerability categorized as critical has been discovered in SourceCodester Loan Management System 1.0. This affects an unknown part of the component Frontend Interface. Such manipulation of the argument interest_percentage leads to logic error. This vulnerability is listed as CVE-2026-30521. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in SourceCodester Loan Management System 1.0 and classified as critical. Affected by this issue is an unknown functionality of the component Frontend Interface. The manipulation of the argument interest_percentage with an unknown input leads to a logic error vulnerability. Using CWE to declare the problem leads to CWE-840. Impacted is integrity. CVE summarizes:

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 advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-30521 since 03/04/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/01/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• SourceCodester

Name

• Loan Management System

Version

• 1.0

License

• free

Website

• Vendor: https://www.sourcecodester.com/

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Duplicate

• Submit #XXXXXX: Xxxxxxxxxxxxxx Xxxx Xxxxxxxxxx Xxxxxx X.x Xxxxxxxx Xxxxx Xxxxxx (by github.com)

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