Executive Summary

CVE-2026-3790 is a SQL injection vulnerability found in SourceCodester Sales and Inventory System version 1.0. The flaw exists in the POST parameter handler of the file check_supplier_details.php, specifically involving the stock_name1 parameter.

An attacker can manipulate the stock_name1 parameter with crafted input to inject arbitrary SQL commands because the application does not properly sanitize this input. This allows the attacker to modify the intended SQL query executed by the system.

The vulnerability supports various SQL injection techniques including UNION-based, Boolean-based blind, and time-based blind injections, enabling attackers to retrieve sensitive database information such as supplier details and credentials.

The attack can be executed remotely and requires authentication. Proof-of-concept exploits are publicly available, and the vulnerability is considered easy to exploit.

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Impact Analysis

This vulnerability can impact you by allowing attackers to compromise the confidentiality, integrity, and availability of your Sales and Inventory System.

• Attackers can extract sensitive data such as supplier information and credentials directly from the database.
• They can manipulate or modify database contents, potentially disrupting business operations.
• The system’s availability may be affected if attackers exploit the vulnerability to perform denial-of-service or other disruptive actions.

Because the exploit can be executed remotely and is easy to perform, it poses a significant risk if the system is exposed to untrusted networks.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by testing the POST parameter "stock_name1" in the file check_supplier_details.php for SQL injection flaws. An authenticated user can send crafted POST requests with malicious payloads to check if the system is vulnerable.'}, {'type': 'paragraph', 'content': 'One effective method is to use the sqlmap tool to automate detection and exploitation attempts. For example, the following command can be used to test the vulnerability:'}, {'type': 'paragraph', 'content': 'sqlmap -u "http://127.0.0.1:8089/check_supplier_details.php" --data "stock_name1=Test+Supplier" --batch -v 6 --risk=3 --cookie "PHPSESSID=YOUR_COOKIE_HERE"'}, {'type': 'paragraph', 'content': 'Additionally, manual testing can be performed by sending POST requests with payloads such as UNION-based, Boolean-based blind, or time-based blind SQL injection strings in the "stock_name1" parameter to observe if the system behaves unexpectedly or returns database errors.'}, {'type': 'list_item', 'content': "UNION-based payload example: stock_name1=Test Supplier' UNION ALL SELECT NULL,NULL,NULL,CONCAT(0x71716b7171,0x49785943476c514266495a6d73764652796e6f66566c5a645a4c546c686d6c487056727754727353,0x716b626b71),NULL,NULL#"}, {'type': 'list_item', 'content': "Boolean-based blind payload example: stock_name1=Test Supplier' OR NOT 2722=2722#"}, {'type': 'list_item', 'content': "Time-based blind payload example: stock_name1=Test Supplier' AND (SELECT 6459 FROM (SELECT(SLEEP(5)))ViNT)-- fojh"}] [3]

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Mitigation Strategies

There are no documented mitigations or countermeasures specifically provided for this vulnerability.

The recommended immediate step is to replace or upgrade the affected component or product to a version that is not vulnerable.

In the meantime, restricting access to the vulnerable endpoint, implementing web application firewall (WAF) rules to detect and block SQL injection attempts, and ensuring proper input validation and sanitization can help reduce risk.

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