CVE-2021-47897 Overview
PEEL Shopping 9.3.0 contains a stored cross-site scripting (XSS) vulnerability in the address parameter of the change_params.php script. This vulnerability allows attackers to inject malicious JavaScript payloads that persist in the application and execute when users interact with the address text box, potentially enabling unauthorized client-side script execution in the context of other users' sessions.
Critical Impact
Attackers can inject persistent malicious scripts that execute in victims' browsers, potentially leading to session hijacking, credential theft, and unauthorized actions performed on behalf of legitimate users.
Affected Products
- PEEL Shopping 9.3.0
- PEEL Shopping e-commerce platform versions prior to patched releases
Discovery Timeline
- 2026-01-23 - CVE CVE-2021-47897 published to NVD
- 2026-01-26 - Last updated in NVD database
Technical Details for CVE-2021-47897
Vulnerability Analysis
This stored cross-site scripting vulnerability (CWE-79) exists due to improper input validation and output encoding in PEEL Shopping's change_params.php script. The application fails to properly sanitize user-supplied input in the address parameter before storing it in the database and subsequently rendering it in the user interface.
When a user enters or modifies their address information, the application stores the raw input without adequate sanitization. This stored payload is then retrieved and displayed to users who view or interact with the address text box, causing the injected JavaScript to execute in their browser context.
The network-based attack vector requires low privileges to exploit, as an attacker needs an authenticated account to access the address modification functionality. However, once the malicious payload is stored, it can affect any user who interacts with the compromised data.
Root Cause
The root cause of this vulnerability is insufficient input validation and output encoding in the change_params.php script. The application directly stores user input from the address parameter without properly sanitizing it for HTML and JavaScript contexts. When this stored data is rendered back to users, the lack of proper output encoding allows injected script content to execute as active code rather than being displayed as harmless text.
Attack Vector
The attack vector is network-based, requiring an authenticated attacker to submit a crafted payload through the address parameter in change_params.php. The attacker injects malicious JavaScript code into the address field, which is then stored in the application's database. When other users (including administrators) view or interact with the address information, the malicious script executes in their browser session.
This stored XSS attack can be leveraged to steal session cookies, capture keystrokes, redirect users to malicious sites, or perform actions on behalf of the victim user. The persistence of the payload makes this vulnerability particularly dangerous as it can affect multiple users over time without requiring repeated attacker interaction.
Technical details and proof-of-concept information can be found in the Exploit-DB #49553 entry and the VulnCheck Advisory.
Detection Methods for CVE-2021-47897
Indicators of Compromise
- Unusual JavaScript patterns or script tags appearing in address fields within the database
- Unexpected network requests originating from user browsers to external domains
- User reports of unexpected behavior when viewing address information
- Browser console errors or unexpected script execution warnings
Detection Strategies
- Implement web application firewall (WAF) rules to detect XSS patterns in POST requests to change_params.php
- Monitor database fields for suspicious HTML/JavaScript content using automated scanning tools
- Deploy content security policy (CSP) headers and monitor for violations
- Review application logs for unusual parameter values in address-related requests
Monitoring Recommendations
- Enable detailed logging for all requests to change_params.php and related scripts
- Configure alerts for CSP violation reports that may indicate XSS exploitation attempts
- Implement real-time monitoring for unusual patterns in user-submitted form data
- Regularly audit stored user data for signs of injected malicious content
How to Mitigate CVE-2021-47897
Immediate Actions Required
- Upgrade PEEL Shopping to the latest available version with security patches applied
- Audit existing database records for malicious scripts in address fields and sanitize compromised data
- Implement input validation and output encoding as an additional defense layer
- Deploy a web application firewall with XSS protection rules enabled
Patch Information
Organizations using PEEL Shopping 9.3.0 should upgrade to the latest patched version available. Refer to the Archived Peel Website for historical version information and the VulnCheck Advisory for detailed remediation guidance.
Workarounds
- Implement strict input validation on the server-side to reject or sanitize HTML and JavaScript in address fields
- Apply output encoding when displaying user-supplied data to prevent script execution
- Deploy Content Security Policy (CSP) headers to restrict inline script execution
- Consider disabling or restricting access to change_params.php until a patch can be applied
# Example Content Security Policy header configuration for Apache
# Add to .htaccess or Apache configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; object-src 'none';"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
