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

CVE-2025-67683 Overview

CVE-2025-67683 is a reflected Cross-Site Scripting (XSS) vulnerability in Opensolution Quick.Cart, an e-commerce platform. The flaw resides in the handling of the sSort parameter, which fails to properly sanitize user-supplied input before reflecting it in the HTTP response. An attacker can craft a malicious URL that, when visited by an authenticated or anonymous user, executes arbitrary JavaScript in the victim's browser context. Version 6.7 has been confirmed vulnerable, and the vendor did not provide a definitive affected version range. Other releases may also be impacted but were not validated by the reporting researchers. The weakness is tracked under [CWE-79].

Critical Impact

Attackers can execute arbitrary JavaScript in a victim's browser, enabling session theft, credential harvesting, and unauthorized actions on behalf of the user.

Affected Products

• Opensolution Quick.Cart 6.7 (confirmed vulnerable)
• Other Quick.Cart versions (untested, potentially vulnerable)
• Deployments exposing the sSort URL parameter to unauthenticated users

Discovery Timeline

• 2026-01-22 - CVE-2025-67683 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2025-67683

Vulnerability Analysis

The vulnerability is a reflected XSS issue in the Quick.Cart web application. The sSort HTTP request parameter, used to control sort order on listing pages, is echoed back into the rendered HTML response without adequate encoding or input filtering. When a victim clicks a crafted link, the injected payload executes inside the same origin as the Quick.Cart store.

Reflected XSS in an e-commerce context is particularly impactful because attackers can target administrators or customers viewing product or order pages. Successful exploitation enables session cookie theft, forced administrative actions through cross-site request forgery chaining, payment form manipulation, and redirection to phishing pages mimicking the legitimate storefront.

The EPSS data indicates a low current probability of opportunistic exploitation, but targeted phishing campaigns against store administrators remain a realistic abuse scenario. The vulnerability requires user interaction, as the victim must click or load the attacker-controlled URL.

Root Cause

The root cause is improper neutralization of input during web page generation [CWE-79]. The application takes the sSort query string value and inserts it into HTML output without applying contextual output encoding (HTML entity encoding, attribute encoding, or JavaScript escaping). Any payload containing HTML control characters such as <, >, or quotation marks breaks out of the intended data context and is parsed as markup or script.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker crafts a URL pointing at the targeted Quick.Cart instance with a malicious value supplied in the sSort parameter. The URL is then delivered to a victim via phishing email, instant messaging, malicious advertisement, or a third-party site under attacker control. When the victim's browser loads the URL, the injected script runs with full access to the Quick.Cart origin, including cookies that are not marked HttpOnly, the Document Object Model (DOM), and any client-side storage.

The vulnerability mechanism is documented in the CERT Polska advisory. No public proof-of-concept exploit code is available at this time.

Detection Methods for CVE-2025-67683

Indicators of Compromise

• HTTP requests to Quick.Cart endpoints containing sSort parameter values with HTML or JavaScript syntax such as <script, onerror=, javascript:, or encoded equivalents like %3Cscript
• Referer headers in web logs pointing to untrusted external domains immediately preceding administrative actions
• Unexpected outbound requests from user browsers to attacker-controlled domains shortly after visiting Quick.Cart pages

Detection Strategies

• Deploy a Web Application Firewall (WAF) with reflected XSS signatures inspecting all query string parameters, especially sSort
• Review web server access logs for anomalous query strings containing angle brackets, event handler keywords, or URL-encoded script tags
• Implement a Content Security Policy (CSP) with reporting enabled to surface inline script execution violations

Monitoring Recommendations

• Enable CSP violation reporting endpoints and aggregate reports to identify reflected payloads in the wild
• Monitor administrator session activity for unusual actions following access to externally referred URLs
• Alert on HTTP 200 responses to Quick.Cart endpoints where the request contains suspicious sSort payloads, indicating successful reflection

How to Mitigate CVE-2025-67683

Immediate Actions Required

• Inventory all Quick.Cart deployments and identify instances running version 6.7 or other untested releases
• Place a WAF rule in front of Quick.Cart applications to block requests where the sSort parameter contains HTML control characters or script keywords
• Restrict administrative panel access to trusted IP ranges or VPN networks to reduce the phishing attack surface
• Mark all session cookies with the HttpOnly and Secure flags to limit theft via injected JavaScript

Patch Information

As of the last NVD update on 2026-02-19, the vendor Opensolution has not published an official advisory or fixed version. The reporting party noted the vendor was contacted but did not respond with vulnerability or version details. Administrators should monitor the OpenSolution product page and the CERT Polska advisory for patch availability.

Workarounds

• Implement a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
• Configure WAF rules to reject any request where the sSort parameter value contains characters such as <, >, ", ', or the substring javascript:
• Apply server-side output encoding by patching the affected template or controller to HTML-encode the sSort value before reflection
• Educate administrators and staff to avoid clicking Quick.Cart URLs received from untrusted sources

# Example ModSecurity rule blocking script-like payloads in sSort
SecRule ARGS:sSort "@rx (?i)(<script|onerror=|onload=|javascript:|%3Cscript)" \
  "id:1006783,\
   phase:2,\
   deny,\
   status:403,\
   msg:'CVE-2025-67683 Quick.Cart sSort XSS attempt blocked',\
   logdata:'Matched sSort value: %{MATCHED_VAR}'"