CVE-2025-67683: Quick.Cart Reflected XSS Vulnerability

CVE-2025-67683 Overview

Quick.Cart is vulnerable to reflected Cross-Site Scripting (XSS) via the sSort parameter. An attacker can craft a malicious URL which, when opened by a victim, results in arbitrary JavaScript execution in the victim's browser. This vulnerability allows attackers to potentially steal session cookies, redirect users to malicious websites, or perform actions on behalf of authenticated users.

The vendor was notified early about this vulnerability but did not respond with details regarding the vulnerability or the vulnerable version range. Only version 6.7 was tested and confirmed as vulnerable; other versions were not tested and might also be vulnerable.

Critical Impact

Attackers can execute arbitrary JavaScript in victims' browsers, potentially leading to session hijacking, credential theft, or malicious actions performed under the victim's identity.

Affected Products

• Quick.Cart version 6.7 (confirmed vulnerable)
• Other Quick.Cart versions (potentially vulnerable - not tested)

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-67683 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-67683

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as reflected Cross-Site Scripting (XSS). The vulnerability exists in Quick.Cart's handling of the sSort parameter, where user-supplied input is reflected back to the browser without proper sanitization or encoding.

When a user clicks on a maliciously crafted URL containing JavaScript code in the sSort parameter, the application reflects this input directly into the HTML response. The browser then interprets and executes the injected script in the context of the vulnerable domain, giving the attacker access to the victim's session and any data accessible within that context.

The attack requires user interaction—specifically, the victim must click on a malicious link. However, attackers commonly distribute such links through phishing emails, social media, or by embedding them in legitimate-looking websites.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the Quick.Cart application. The sSort parameter accepts user input that is directly embedded into the HTML response without proper sanitization. The application fails to:

1. Validate that the sSort parameter contains only expected values (e.g., sort field names)
2. Encode special HTML characters before reflecting the input in the response
3. Implement Content Security Policy (CSP) headers that could mitigate the impact of XSS

Attack Vector

The attack is network-based and requires the victim to interact with a malicious URL. A typical attack scenario involves:

1. The attacker crafts a URL containing malicious JavaScript in the sSort parameter
2. The attacker distributes this URL via phishing emails, social engineering, or compromised websites
3. When the victim clicks the link and visits the Quick.Cart site, the malicious script executes in their browser
4. The script can then steal session cookies, capture keystrokes, or redirect the user to a phishing page

The vulnerability can be exploited by embedding JavaScript payloads in the sSort parameter. When the application reflects this parameter value in the response without proper encoding, the browser executes the injected script. For detailed technical information, refer to the CERT Poland advisory.

Detection Methods for CVE-2025-67683

Indicators of Compromise

• Unusual URL patterns containing encoded JavaScript in the sSort parameter
• Web server logs showing requests with script tags or JavaScript event handlers in query parameters
• Reports from users about unexpected redirects or strange behavior when using Quick.Cart
• Browser console errors or security warnings related to inline script execution

Detection Strategies

• Configure Web Application Firewall (WAF) rules to detect and block requests containing script tags or JavaScript event handlers in URL parameters
• Implement log monitoring for suspicious patterns in the sSort parameter, such as <script>, javascript:, or HTML event attributes
• Deploy Content Security Policy (CSP) violation reporting to identify XSS exploitation attempts
• Use SentinelOne's web protection capabilities to detect malicious JavaScript execution patterns

Monitoring Recommendations

• Enable verbose logging for Quick.Cart application requests, particularly focusing on query string parameters
• Set up alerts for requests containing common XSS payload signatures in URL parameters
• Monitor for unusual outbound connections from user browsers that might indicate data exfiltration
• Review referrer headers for traffic originating from suspicious or unknown sources

How to Mitigate CVE-2025-67683

Immediate Actions Required

• Audit all instances of Quick.Cart in your environment and identify installations running version 6.7 or other potentially vulnerable versions
• Implement Web Application Firewall (WAF) rules to filter requests containing potential XSS payloads in the sSort parameter
• Consider temporarily restricting access to Quick.Cart installations until proper mitigations are in place
• Educate users about the risks of clicking on suspicious links, especially those containing complex query parameters

Patch Information

No official patch information is available at this time. The vendor was notified early about this vulnerability but did not respond with details regarding the vulnerability or remediation. Organizations should monitor the OpenSolution Quick Cart page for future security updates.

For additional technical details and updates, refer to the CERT Poland CVE-2025-67683 advisory.

Workarounds

• Implement input validation at the web server or reverse proxy level to restrict the sSort parameter to expected values only
• Deploy a Web Application Firewall (WAF) with XSS protection rules enabled
• Add Content Security Policy (CSP) headers to prevent inline script execution
• Consider using a reverse proxy to sanitize URL parameters before they reach the application

# Example Apache mod_rewrite rule to sanitize sSort parameter
# Add to .htaccess or Apache configuration
RewriteEngine On
RewriteCond %{QUERY_STRING} sSort=.*(<|>|script|javascript|onload|onerror) [NC]
RewriteRule .* - [F,L]

# Example Content-Security-Policy header (add to server config)
# Header set Content-Security-Policy "default-src 'self'; script-src 'self'"