📄 Description (English)
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 penalty rates for overdue payments. While the frontend interface prevents users from entering negative numbers in the "Monthly Overdue Penalty" field, 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 penalty_rate.
🤖 AI Executive Summary
CVE-2026-30522 is a business logic vulnerability in SourceCodester Loan Management System v1.0 that allows authenticated administrators to bypass client-side validation and submit negative penalty rates for overdue loan payments. By manipulating HTTP POST requests, attackers can create loan plans with negative penalties, potentially enabling fraudulent loan forgiveness or financial manipulation. With an available exploit and no patch, this poses immediate risk to financial institutions using this system.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 12, 2026 22:01
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi financial institutions, particularly smaller banks and microfinance companies using SourceCodester Loan Management System. Primary risk sectors include: Banking (SAMA-regulated institutions), Fintech companies, and credit unions. Malicious administrators or compromised admin accounts could manipulate loan penalty calculations, resulting in revenue loss, regulatory violations with SAMA, and potential fraud. The vulnerability is particularly dangerous in Saudi Arabia's growing fintech sector where such systems may manage significant loan portfolios.
🏢 Affected Saudi Sectors
Banking
Fintech
Microfinance
Credit Unions
Government Financial Services
Insurance (if using for premium calculations)
🎯 MITRE ATT&CK Techniques
T1190 - Exploit Public-Facing Application: Authenticated exploitation of web application
T1589 - Gather Victim Identity Information: Potential access to loan and customer data
T1110 - Brute Force: Could be combined with credential compromise
T1078 - Valid Accounts: Exploitation requires valid admin credentials
T1565 - Data Manipulation: Direct manipulation of financial data through logic bypass
T1040 - Network Sniffing: HTTP request manipulation requires network access
T1021 - Remote Services: Admin panel access required
⚖️ Saudi Risk Score (AI)
7.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Audit all loan plans created in the past 6 months to identify any with negative penalty rates
2. Disable the Loan Management System or restrict admin access to trusted personnel only
3. Review transaction logs for suspicious penalty rate modifications
4. Implement database-level constraints to prevent negative penalty values
Patching Guidance:
1. Contact SourceCodester for security updates or consider alternative solutions
2. Implement server-side validation: reject any penalty_rate values less than 0 before database insertion
3. Add input validation middleware that enforces business logic rules on the backend
4. Implement role-based access controls limiting loan plan creation to authorized personnel
Compensating Controls:
1. Deploy Web Application Firewall (WAF) rules to detect and block POST requests with negative penalty values
2. Implement API request logging and alerting for loan plan modifications
3. Require multi-factor authentication for admin accounts
4. Conduct monthly audits of loan plan configurations
5. Implement database triggers to reject negative penalty rate insertions
Detection Rules:
1. Monitor HTTP POST requests to loan plan endpoints for negative numeric values in penalty_rate parameter
2. Alert on any modification to existing loan plans by admin accounts
3. Track database INSERT/UPDATE operations on loan_plans table with penalty_rate < 0
4. Flag admin accounts accessing loan plan creation functionality outside business hours
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تدقيق جميع خطط القروض المنشأة في آخر 6 أشهر لتحديد أي منها بمعدلات عقوبة سالبة
2. تعطيل نظام إدارة القروض أو تقييد وصول المسؤول للموظفين الموثوقين فقط
3. مراجعة سجلات المعاملات للتعديلات المريبة على معدلات العقوبة
4. تنفيذ قيود على مستوى قاعدة البيانات لمنع قيم العقوبة السالبة
إرشادات التصحيح:
1. الاتصال بـ SourceCodester للحصول على تحديثات أمان أو النظر في حلول بديلة
2. تنفيذ التحقق من صحة الخادم: رفض أي قيم penalty_rate أقل من 0 قبل إدراج قاعدة البيانات
3. إضافة برنامج وسيط للتحقق من الإدخال يفرض قواعد منطق الأعمال على الخادم
4. تنفيذ التحكم في الوصول القائم على الأدوار يقيد إنشاء خطط القروض للموظفين المصرحين
الضوابط البديلة:
1. نشر قواعد جدار حماية تطبيقات الويب (WAF) للكشف عن طلبات POST بقيم عقوبة سالبة وحجبها
2. تنفيذ تسجيل التنبيهات لتعديلات خطة القروض
3. طلب المصادقة متعددة العوامل لحسابات المسؤول
4. إجراء تدقيق شهري لتكوينات خطة القروض
5. تنفيذ محفزات قاعدة البيانات لرفض إدراجات معدل العقوبة السالبة
قواعد الكشف:
1. مراقبة طلبات HTTP POST لنقاط نهاية خطة القروض للقيم الرقمية السالبة في معامل penalty_rate
2. التنبيه على أي تعديل لخطط القروض الموجودة من قبل حسابات المسؤول
3. تتبع عمليات INSERT/UPDATE على جدول loan_plans بـ penalty_rate < 0
4. وضع علامة على حسابات المسؤول التي تصل إلى وظيفة إنشاء خطة القروض خارج ساعات العمل
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control: Inadequate backend validation violates principle of least privilege
ECC 2024 A.5.2.1 - User Access Management: Admin accounts lack proper input validation controls
ECC 2024 A.6.1.2 - Cryptography and Data Protection: Financial data integrity compromised by logic bypass
ECC 2024 A.7.1.1 - Audit and Accountability: Insufficient logging of loan plan modifications
🔵 SAMA CSF
SAMA CSF Governance & Risk Management: Business logic vulnerabilities in financial systems violate risk management principles
SAMA CSF Information & Cybersecurity: Inadequate input validation and server-side controls
SAMA CSF Operational Resilience: System integrity compromised by manipulation of penalty calculations
SAMA CSF Third-Party Risk: If system is outsourced, vendor security controls are insufficient
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Access Control: Insufficient validation of privileged user actions
ISO 27001:2022 A.8.3 - Cryptography: Data integrity controls inadequate for financial transactions
ISO 27001:2022 A.8.22 - Information Security Incident Management: Lack of detection mechanisms for exploitation
ISO 27001:2022 A.8.32 - Change Management: No validation controls in change/creation processes
🟣 PCI DSS v4.0.1
PCI DSS 6.5.1 - Injection flaws: Business logic injection through unvalidated input
PCI DSS 6.5.10 - Broken authentication/authorization: Admin access without proper input validation
PCI DSS 10.2.1 - Audit trails: Insufficient logging of loan plan modifications
PCI DSS 11.3 - Penetration testing: Logic vulnerabilities would be identified in security assessments
📦 Affected Products / CPE 1 entries
oretnom23:loan_management_system:1.0