CVE-2026-30521: n/a
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.
AI Analysis
Technical Summary
The vulnerability arises from improper server-side validation in SourceCodester Loan Management System v1.0. The frontend interface restricts negative interest rates, but this is not enforced on the backend. An authenticated user can exploit this by submitting a negative interest_percentage via HTTP POST, resulting in loan plans with negative interest rates. This is classified as a CWE-602 (Improper Restriction of Functionality). The CVSS 3.1 base score is 6.5, reflecting medium severity with network attack vector, low attack complexity, and requiring privileges but no user interaction.
Potential Impact
The impact is limited to integrity as the attacker can create loan plans with negative interest rates, potentially manipulating loan terms or financial calculations. There is no direct confidentiality or availability impact reported. The vulnerability requires authentication and does not allow remote unauthenticated exploitation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, administrators should monitor and restrict access to the loan plan creation functionality to trusted users only. Implementing server-side validation to reject negative interest rates is recommended as a corrective measure.
CVE-2026-30521: n/a
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability arises from improper server-side validation in SourceCodester Loan Management System v1.0. The frontend interface restricts negative interest rates, but this is not enforced on the backend. An authenticated user can exploit this by submitting a negative interest_percentage via HTTP POST, resulting in loan plans with negative interest rates. This is classified as a CWE-602 (Improper Restriction of Functionality). The CVSS 3.1 base score is 6.5, reflecting medium severity with network attack vector, low attack complexity, and requiring privileges but no user interaction.
Potential Impact
The impact is limited to integrity as the attacker can create loan plans with negative interest rates, potentially manipulating loan terms or financial calculations. There is no direct confidentiality or availability impact reported. The vulnerability requires authentication and does not allow remote unauthenticated exploitation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, administrators should monitor and restrict access to the loan plan creation functionality to trusted users only. Implementing server-side validation to reject negative interest rates is recommended as a corrective measure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-03-04T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
Threat ID: 69cc149be6bfc5ba1d3026cc
Added to database: 3/31/2026, 6:38:19 PM
Last enriched: 4/8/2026, 12:01:55 AM
Last updated: 5/15/2026, 10:58:34 AM
Views: 76
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