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The CVE-2025-22096 vulnerability in code16 Sharp v9.6.6 is a Cross-Site Scripting (XSS) flaw located within the `src/Form/Fields/SharpFormUploadField.php` component. This field handles file uploads and the rendering of associated metadata. The vulnerability arises due to insufficient sanitization and output encoding of user-supplied input before it is rendered in the browser. Specifically, when an attacker uploads a file with a maliciously crafted filename or other controllable metadata, the application unsafely incorporates this data into the HTML response. This allows an attacker to inject arbitrary JavaScript code into the web page. When a victim, such as an administrator, views the page containing the malicious upload, the injected script executes within the context of the victim’s session. This can lead to session hijacking, unauthorized actions performed on behalf of the user, or defacement of the application, all without a direct compromise of the server.
Platform: code16 Sharp
Version: v9.6.6
Vulnerability : Cross Site Scripting
Severity: Moderate
date: 2025-10-21
Prediction: Patch by 2025-11-04
What Undercode Say:
Searching for the vulnerable file in a project find . -name "SharpFormUploadField.php" Grepping for common XSS sinks in PHP (example patterns) grep -n "echo.\$_GET" src/Form/Fields/SharpFormUploadField.php grep -n "echo.\$_POST" src/Form/Fields/SharpFormUploadField.php grep -n ".=.filename" src/Form/Fields/SharpFormUploadField.php
// Example of vulnerable code pattern (conceptual) // In SharpFormUploadField.php render method: $fileName = $_FILES['upload']['name']; // User-controlled input echo " <div>Uploaded File: " . $fileName . "</div> "; // Unsanitized output // Secure code would use htmlspecialchars echo " <div>Uploaded File: " . htmlspecialchars($fileName, ENT_QUOTES, 'UTF-8') . "</div> ";
How Exploit:
Attacker uploads file.
Malicious filename contains script.
Admin views upload list.
Script executes automatically.
Session cookie is stolen.
Protection from this CVE
Sanitize all user inputs.
Apply output encoding.
Use Content Security Policy.
Update to patched version.
Impact:
Session Hijacking
Unauthorized Actions
Data Theft
Website Defacement
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Sources:
Reported By: github.com
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