Executive Summary

CVE-2026-30556 is a Reflected Cross-Site Scripting (XSS) vulnerability found in the SourceCodester Sales and Inventory System version 1.0, specifically in the index.php file via the "msg" parameter.

The vulnerability occurs because the application does not properly sanitize or escape the input received through the "msg" parameter in a GET request. This allows remote attackers to inject arbitrary web scripts or HTML code via a crafted URL.

When a victim accesses such a crafted URL, the malicious script executes in their browser context, potentially leading to unauthorized actions.

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Impact Analysis

This vulnerability can have several impacts on users and the system:

• Attackers can execute arbitrary JavaScript code in the victim's browser.
• It can lead to session hijacking by stealing session cookies.
• Attackers can perform phishing attacks by altering page content to deceive users.
• It may allow attackers to execute actions on behalf of the user without their consent.

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Detection Guidance

This vulnerability can be detected by testing the "msg" parameter in the index.php page for reflected Cross-Site Scripting (XSS). One way to do this is by accessing a crafted URL that injects a script payload and observing if the script executes.

For example, you can use a web browser or command-line tools like curl to send a GET request with a payload in the "msg" parameter.

• curl "http://<target-ip-or-domain>/index.php?msg=%3Cimg%20src=%22x%22%20onerror=%22alert(789547)%22%3E&type=error"

If the alert or injected script executes or the payload is reflected unsanitized in the response, it confirms the presence of the vulnerability.

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Compliance Impact

The Reflected Cross-Site Scripting (XSS) vulnerability in the SourceCodester Sales and Inventory System 1.0 allows attackers to execute arbitrary scripts in users' browsers, which can lead to session hijacking, phishing, and unauthorized actions on behalf of users.

Such security weaknesses can impact compliance with common standards and regulations like GDPR and HIPAA because they may lead to unauthorized access to personal or sensitive data, compromise user privacy, and fail to ensure adequate protection of user information.

Specifically, GDPR requires organizations to implement appropriate technical measures to protect personal data, and XSS vulnerabilities undermine this by enabling attackers to steal session cookies or manipulate user interactions.

Similarly, HIPAA mandates safeguarding electronic protected health information (ePHI), and vulnerabilities like XSS can expose such information through unauthorized access or manipulation.

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Mitigation Strategies

To mitigate the Reflected Cross-Site Scripting (XSS) vulnerability in SourceCodester Sales and Inventory System 1.0, immediate steps include sanitizing and properly escaping the input received via the "msg" parameter in the index.php file.

Additionally, avoid using unsanitized user input directly in the HTML output. Implement input validation and output encoding to prevent injection of arbitrary scripts.

As a temporary measure, restrict access to the affected page or disable the vulnerable functionality until a patch or update is available.

Educate users to avoid clicking on suspicious or crafted URLs that may exploit this vulnerability.

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