Urgent: Reflected XSS Vulnerability Discovered in xCally Omnichannel v3.30.1 (CVE-2025-40681)

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Overview

A reflected Cross-Site Scripting (XSS) vulnerability, identified as CVE-2025-40681, has been discovered in xCally Omnichannel version 3.30.1. This vulnerability allows an attacker to inject malicious JavaScript code into a user’s browser by crafting a specially designed URL. When a user clicks on this malicious URL, the injected script will execute, potentially leading to data theft or other malicious activities.

Technical Details

The vulnerability lies within the /login endpoint of xCally Omnichannel v3.30.1. The failureMessage parameter is susceptible to XSS. An attacker can embed malicious JavaScript code within the value of this parameter. When a user accesses a URL containing the malicious code in the failureMessage, the code is executed in the user’s browser because the application does not properly sanitize or encode the input.

Here’s a simplified example of a malicious URL:


      https://xcally.example.com/login?failureMessage=<script>alert('XSS Vulnerability!')</script>

In this example, the alert('XSS Vulnerability!') JavaScript code will be executed when the user visits the URL.

CVSS Analysis

Due to limited information, the CVSS score is currently N/A. A proper CVSS score would require a detailed analysis of the attack vector, attack complexity, privileges required, user interaction, scope, confidentiality impact, integrity impact, and availability impact. Given the nature of reflected XSS, user interaction is typically required. The potential impact could range from stealing session cookies to defacing the website, depending on the privileges of the targeted user.

Possible Impact

Successful exploitation of this XSS vulnerability can have several severe consequences:

  • Session Hijacking: An attacker can steal a user’s session cookies, allowing them to impersonate the user and gain unauthorized access to their account.
  • Data Theft: Sensitive data, such as credentials or personal information, displayed on the page can be stolen by the injected script.
  • Website Defacement: The attacker can modify the appearance of the website, potentially damaging the organization’s reputation.
  • Malware Distribution: The injected script can redirect users to malicious websites, leading to malware infections.
  • Phishing Attacks: The attacker can display fake login forms to steal user credentials.

Mitigation and Patch Steps

To mitigate this XSS vulnerability, the following steps are recommended:

  • Upgrade xCally Omnichannel: The most effective solution is to upgrade to a patched version of xCally Omnichannel where this vulnerability has been addressed. Contact xCally support for the latest version and patch information.
  • Input Validation and Sanitization: Implement robust input validation and sanitization on the server-side to prevent malicious code from being injected through the failureMessage parameter. Specifically, escape or encode any user-supplied data before rendering it in the HTML.
  • Output Encoding: Use appropriate output encoding techniques when displaying user-provided data to prevent the browser from interpreting it as executable code.
  • Web Application Firewall (WAF): Deploy a Web Application Firewall (WAF) to detect and block XSS attacks. Configure the WAF to filter out potentially malicious input.
  • Educate Users: Train users to be cautious about clicking on links from untrusted sources.

References

INCIBE-CERT Advisory: Cross-Site Scripting (XSS) in xCally Omnichannel

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