CVE-2026-5647: Online Shoe Store XSS Vulnerability

CVE-2026-5647 Overview

A stored Cross-Site Scripting (XSS) vulnerability has been identified in code-projects Online Shoe Store version 1.0. The vulnerability exists in the Add Product Page functionality within the /admin/admin_feature.php file. By manipulating the product_name argument, an attacker with administrative privileges can inject malicious scripts that execute in the context of other users' browsers when they view the affected product.

Critical Impact

Administrative users can inject persistent malicious scripts through the product name field, potentially leading to session hijacking, credential theft, or further exploitation of users viewing product pages.

Affected Products

• code-projects Online Shoe Store 1.0
• Admin panel component (/admin/admin_feature.php)
• Add Product Page functionality

Discovery Timeline

• 2026-04-06 - CVE-2026-5647 published to NVD
• 2026-04-07 - Last updated in NVD database

Technical Details for CVE-2026-5647

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The flaw resides in the Add Product Page of the Online Shoe Store administrative interface, specifically in how the application processes the product_name parameter.

When an administrator adds a new product, the product_name field fails to properly sanitize or encode user-supplied input before storing it in the database and subsequently rendering it on product display pages. This allows an attacker with administrative access to inject arbitrary JavaScript code that persists in the application and executes whenever the affected product is viewed.

The network-based attack vector means the vulnerability can be exploited remotely, though it requires privileged access (administrative credentials) and user interaction (a victim must view the affected page) for successful exploitation. The exploit has been publicly disclosed, increasing the risk of opportunistic attacks.

Root Cause

The root cause of CVE-2026-5647 is insufficient input validation and output encoding in the admin_feature.php file. The application directly incorporates user-supplied data from the product_name parameter into the HTML output without proper sanitization. This violates secure coding principles that require all user input to be treated as untrusted and properly escaped before being rendered in web pages.

Attack Vector

The attack is executed remotely over the network through the following process:

1. An attacker with administrative credentials accesses the Add Product Page at /admin/admin_feature.php
2. The attacker enters malicious JavaScript code in the product_name field (e.g., <script>alert('XSS')</script> or more sophisticated payloads)
3. The malicious payload is stored in the application's database without sanitization
4. When any user (administrator or customer) views the product listing or details page, the stored JavaScript executes in their browser context
5. The injected script can then steal session cookies, perform actions on behalf of the victim, redirect users to malicious sites, or deface the application

Technical details and proof-of-concept information can be found in the GitHub Issue Report and VulDB Vulnerability #355435.

Detection Methods for CVE-2026-5647

Indicators of Compromise

• Unusual or suspicious content in product name fields containing HTML tags or JavaScript code
• Product database entries containing <script>, javascript:, onerror=, onload=, or other XSS payload indicators
• Browser console errors or unexpected JavaScript execution when viewing product pages
• Reports from users about unexpected redirects or pop-ups when browsing product listings

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block XSS payloads in form submissions to administrative endpoints
• Deploy database monitoring to alert on entries containing suspicious HTML or JavaScript patterns in product-related tables
• Enable Content Security Policy (CSP) headers to detect and report inline script execution violations
• Conduct regular code reviews and security scans of the /admin/admin_feature.php file and related components

Monitoring Recommendations

• Monitor HTTP request logs for POST requests to /admin/admin_feature.php containing script tags or event handlers
• Implement real-time alerting for database writes that contain known XSS pattern signatures
• Review administrative access logs for unusual activity patterns or unauthorized product modifications
• Deploy browser-based security monitoring to detect unexpected script execution on product pages

How to Mitigate CVE-2026-5647

Immediate Actions Required

• Restrict access to the administrative panel to trusted IP addresses only
• Audit existing product entries in the database for any previously injected malicious content
• Implement input validation on the server-side to reject product names containing HTML tags or special characters
• Apply output encoding (HTML entity encoding) to all user-supplied data rendered on web pages
• Enable Content Security Policy (CSP) headers to mitigate the impact of successful XSS attacks

Patch Information

As of the last update on 2026-04-07, no official patch has been released by code-projects for this vulnerability. Organizations using Online Shoe Store 1.0 should implement the workarounds described below and monitor the Code Projects website for security updates.

For additional vulnerability intelligence, refer to the VulDB CTI for #355435.

Workarounds

• Implement server-side input validation using allowlists to restrict the product_name field to alphanumeric characters, spaces, and limited punctuation
• Apply HTML entity encoding to all dynamic content rendered in product pages using functions like htmlspecialchars() in PHP with the ENT_QUOTES flag
• Deploy a Web Application Firewall (WAF) with XSS protection rules enabled for the administrative panel
• Consider temporarily disabling the Add Product functionality until proper sanitization is implemented
• Implement Content Security Policy headers with script-src 'self' to prevent execution of inline scripts

# Apache .htaccess configuration to add Content Security Policy header
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'none';"
    Header set X-Content-Type-Options "nosniff"
    Header set X-XSS-Protection "1; mode=block"
</IfModule>