| Title | SourceCodester Loan Management System 1.0 Business Logic Errors |
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| Description | A business logic vulnerability exists in Loan Management System 1.0. The issue is located in the save_plan action of the file ajax.php. The application lacks server-side validation for the 'interest_percentage' POST parameter. An authenticated attacker can bypass client-side restrictions to submit negative values, resulting in the creation of loan plans with negative interest rates and corrupting financial calculations. |
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| Source | ⚠️ https://github.com/meifukun/Web-Security-PoCs/blob/main/Loan-Management-System/BusinessLogic-LoanPlan-NegativeInterest.md |
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| User | Anonymous User |
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| Submission | 03/25/2026 03:09 (16 days ago) |
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| Moderation | 04/08/2026 17:14 (15 days later) |
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| Status | Duplicate |
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| VulDB entry | 354488 [SourceCodester Loan Management System 1.0 Frontend Interface interest_percentage logic error] |
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| Points | 0 |
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