Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2025-56605 is a reflected Cross-Site Scripting (XSS) vulnerability in the register.php backend script of the PuneethReddyHC Event Management System version 1.0. The issue occurs because the mobile POST parameter is not properly validated or sanitized before being echoed back in the HTTP response.'}, {'type': 'paragraph', 'content': "This improper handling allows an attacker to inject arbitrary JavaScript code via a crafted POST request. When the victim's browser receives the response, the malicious script executes, potentially compromising the user's session or data."}] [1]

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Impact Analysis

This vulnerability can impact you by allowing attackers to execute arbitrary JavaScript code in the browsers of users interacting with the vulnerable register.php script.

• Stealing user session cookies or authentication tokens.
• Performing actions on behalf of the user without their consent.
• Redirecting users to malicious websites.
• Defacing the website or displaying unwanted content.

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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 sending a crafted POST request to the register.php backend script with a malicious payload in the mobile parameter and observing if the payload is reflected unsanitized in the HTTP response.'}, {'type': 'paragraph', 'content': 'For example, you can use the curl command to test for the vulnerability by sending a POST request with a JavaScript payload in the mobile parameter and checking if it appears in the response without encoding.'}, {'type': 'list_item', 'content': 'curl -X POST -d "mobile=<script>alert(\'XSS\')</script>" http://target-site/backend/register.php -i'}, {'type': 'paragraph', 'content': 'If the response contains the script tags and JavaScript code without any HTML entity encoding, the system is vulnerable to reflected XSS.'}] [1]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'To mitigate this vulnerability, you should sanitize or encode the user input before outputting it in the HTTP response.'}, {'type': 'paragraph', 'content': "Specifically, applying PHP's htmlspecialchars function on the mobile POST parameter will encode special characters and prevent script injection."}, {'type': 'list_item', 'content': "Use: echo htmlspecialchars($_POST['mobile'], ENT_QUOTES, 'UTF-8');"}, {'type': 'paragraph', 'content': 'This ensures that any HTML or JavaScript code submitted via the mobile parameter is safely encoded and not executed by the browser.'}] [1]

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