How can this vulnerability impact me? :

This vulnerability can have serious impacts including unauthorized access to sensitive data stored in the database.

• Extraction of confidential information such as administrator credentials and borrower details.
• Database enumeration that reveals the structure of the database, including tables and columns.

Although exploitation requires authentication, the ability to perform blind SQL injection means attackers can stealthily extract data without direct visibility, posing a significant security risk.

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Can you explain this vulnerability to me?

CVE-2026-30520 is a Time-based Blind SQL Injection vulnerability found in the Loan Management System version 1.0. It exists in the ajax.php file, specifically in the save_loan action, where the application fails to properly sanitize the borrower_id parameter in POST requests.

An authenticated attacker can inject malicious SQL commands into this parameter. By using SQL's SLEEP() function, the attacker can cause time delays in the server's response, allowing them to infer database information one byte at a time without directly seeing the data.

This technique enables unauthorized data exfiltration and database enumeration, including sensitive information such as admin credentials and borrower details.

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How can this vulnerability be detected on my network or system? Can you suggest some commands?

This vulnerability can be detected by testing the `borrower_id` parameter in POST requests to the ajax.php file with the action parameter set to `save_loan` for time-based blind SQL injection.

One method is to intercept the POST request to `ajax.php?action=save_loan` using a proxy tool like Burp Suite and inject payloads that cause time delays, such as using SQL's SLEEP() function.

For example, the following payload can be used in the `borrower_id` parameter to test for the vulnerability:

• id=&borrower_id=1 AND (SELECT 2457 FROM (SELECT(SLEEP(5)))LelR)&loan_type_id=1&plan_id=3&amount=5000&purpose=Business expansion loan

Additionally, sqlmap can be used with the captured request and cookies to automate detection and confirm the injection point. Sqlmap output can identify the backend database and confirm the vulnerability.

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How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:

The vulnerability allows an authenticated attacker to perform blind SQL injection, leading to unauthorized data exfiltration of sensitive information such as admin credentials and borrower details.

This unauthorized access and potential exposure of sensitive personal and administrative data can lead to non-compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive information.

Specifically, the ability to extract confidential data through this vulnerability increases the risk of data breaches, which are subject to regulatory reporting requirements and penalties under these standards.

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What immediate steps should I take to mitigate this vulnerability?

To mitigate the Blind SQL Injection vulnerability in the Loan Management System v1.0, immediate steps include:

• Restrict access to the affected functionality (save_loan action in ajax.php) to only trusted and necessary authenticated users.
• Avoid using default or weak credentials such as admin/admin123 to reduce the risk of unauthorized access.
• Use a web application firewall (WAF) or input filtering to detect and block malicious SQL injection payloads targeting the borrower_id parameter.
• Monitor logs for suspicious activity related to the save_loan action and borrower_id parameter.
• Plan to apply a patch or update the application to properly sanitize and validate user inputs, especially the borrower_id parameter, to prevent SQL injection.

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