Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-32851 is a reflected cross-site scripting (XSS) vulnerability found in MailEnable versions prior to 10.55. It occurs in the webmail interface, specifically through the Attendees parameter in the FreeBusy.aspx page. This parameter is not properly sanitized before being embedded into dynamically generated JavaScript, which allows remote attackers to craft a malicious URL that injects and executes arbitrary JavaScript code in a victim's browser."}] [1]

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Impact Analysis

This vulnerability allows remote attackers to execute arbitrary JavaScript code in the browsers of users who click on a maliciously crafted URL. While it requires user interaction, it can lead to attacks such as session hijacking, defacement, or redirection to malicious sites. However, according to the CVSS score, it does not impact confidentiality, integrity, or availability directly, and its overall severity is considered low.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by testing the webmail interface of MailEnable versions prior to 10.55 for reflected cross-site scripting (XSS) via the Attendees parameter in the FreeBusy.aspx page.'}, {'type': 'paragraph', 'content': 'A common approach is to craft a malicious URL that injects JavaScript code into the Attendees parameter and observe if the code is executed in the browser, indicating the presence of the vulnerability.'}, {'type': 'paragraph', 'content': 'For example, you can use curl or a browser to send a request with a payload in the Attendees parameter and check the response or behavior:'}, {'type': 'list_item', 'content': 'curl -v "http://[target]/FreeBusy.aspx?Attendees=<script>alert(\'XSS\')</script>"'}, {'type': 'list_item', 'content': "Use a browser to visit a URL like: http://[target]/FreeBusy.aspx?Attendees=<script>alert('XSS')</script> and observe if an alert box appears."}, {'type': 'paragraph', 'content': 'If the JavaScript executes, it confirms the vulnerability.'}] [1]

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Mitigation Strategies

The immediate mitigation step is to upgrade MailEnable to version 10.55 or later, where this vulnerability has been addressed.

Until the upgrade can be performed, consider implementing web application firewall (WAF) rules to block or sanitize requests containing suspicious scripts in the Attendees parameter.

Additionally, educate users to avoid clicking on suspicious links that may exploit this vulnerability.

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