CVE-2025-1776: Soteshop XSS Vulnerability

CVE-2025-1776 Overview

CVE-2025-1776 is a reflected Cross-Site Scripting (XSS) vulnerability affecting Soteshop e-commerce platform versions prior to 8.3.4. The flaw resides in the query parameter of the /app-google-custom-search/searchResults endpoint. Remote attackers can inject arbitrary JavaScript that executes in the victim's browser context when a crafted link is opened. Successful exploitation allows theft of session cookies, credential harvesting, or unauthorized actions performed on behalf of authenticated users. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact
Attackers can hijack authenticated Soteshop sessions and execute arbitrary script in the victim's browser by delivering a crafted search URL.

Affected Products

Soteshop versions prior to 8.3.4
Soteshop /app-google-custom-search/searchResults endpoint
Deployments exposing the Google Custom Search integration to unauthenticated users

Discovery Timeline

2025-02-28 - CVE-2025-1776 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-1776

Vulnerability Analysis

The vulnerability affects the Google Custom Search integration in Soteshop. User-supplied input passed through the query parameter is reflected in the search results page without adequate output encoding or input sanitization. Because the reflection occurs in an HTML context, attackers can break out of the intended string boundary and inject script tags or event handlers. The scope change indicated in the advisory reflects that injected script executes in the browser under Soteshop's origin, granting access to session state and DOM data. User interaction is required, meaning the victim must click a crafted link for the payload to fire.

Root Cause

The root cause is improper neutralization of user-controlled input in an HTML response body. The searchResults handler renders the query value directly into markup without applying context-aware encoding. This constitutes a classic reflected XSS pattern as described by CWE-79.

Attack Vector

Exploitation is network-based and requires no authentication. An attacker crafts a URL targeting /app-google-custom-search/searchResults with a malicious JavaScript payload in the query parameter. The attacker then delivers the link through phishing email, social media, or a compromised third-party site. When the victim loads the URL, the server reflects the payload into the rendered page and the browser executes it. The script can read document.cookie, exfiltrate session tokens to an attacker-controlled endpoint, or submit authenticated requests via fetch or XMLHttpRequest.

No verified proof-of-concept code is published. Refer to the INCIBE Security Notice for advisory details.

Detection Methods for CVE-2025-1776

Indicators of Compromise

Web server access logs containing requests to /app-google-custom-search/searchResults with query parameter values containing <script, javascript:, onerror=, onload=, or URL-encoded equivalents such as %3Cscript
Outbound HTTP requests from user browsers to unfamiliar domains immediately after visiting Soteshop search URLs
Session cookies observed in referrer headers or query strings sent to external hosts

Detection Strategies

Deploy Web Application Firewall (WAF) rules that inspect the query parameter for HTML tag characters and common XSS payload signatures
Enable Content Security Policy (CSP) violation reporting to capture inline script execution attempts on Soteshop pages
Review historical access logs for reflected payloads dating back to before the 8.3.4 upgrade

Monitoring Recommendations

Alert on anomalous spikes in requests to /app-google-custom-search/searchResults from single IPs or referrers
Correlate authenticated session activity with unusual geolocation or user-agent changes that may indicate session hijacking
Monitor for user reports of unexpected redirects or pop-ups triggered from search result pages

How to Mitigate CVE-2025-1776

Immediate Actions Required

Upgrade Soteshop to version 8.3.4 or later on all production and staging instances
Invalidate active user sessions after patching to force re-authentication and revoke any tokens that may have been stolen
Audit web server logs for prior exploitation attempts against the vulnerable endpoint

Patch Information

The vendor addressed CVE-2025-1776 in Soteshop 8.3.4. Administrators should apply this release or any later maintenance version. Consult the INCIBE Security Notice for the official advisory and upgrade guidance.

Workarounds

Restrict access to /app-google-custom-search/searchResults at the reverse proxy or WAF layer until the patch is applied
Deploy a strict Content Security Policy that disallows inline scripts and untrusted script sources to reduce impact of reflected payloads
Enforce the HttpOnly and Secure flags on session cookies to prevent JavaScript-based cookie theft

bash

# Example NGINX rule blocking suspicious query values on the vulnerable endpoint
location /app-google-custom-search/searchResults {
    if ($arg_query ~* "(<|%3C)\s*script|javascript:|on(error|load|click)\s*=") {
        return 403;
    }
    proxy_pass http://soteshop_backend;
}

# Example CSP header to mitigate reflected XSS impact
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'";