CVE-2020-10103: 
NixOS vulnerability analysis and mitigation

An XSS (Cross-Site Scripting) vulnerability was discovered in Zammad versions 3.0 through 3.2. The vulnerability, identified as CVE-2020-10103, was disclosed on March 3, 2020, affecting the File Upload functionality in Zammad helpdesk system (NVD, Zammad Advisory).

The vulnerability is classified as a Persistent Cross-Site Scripting (XSS) issue that exists in the File Upload functionality. Low-privileged users can exploit this vulnerability by uploading files containing malicious code. When other users with active Zammad sessions access specially crafted links to the uploaded files, the malicious JavaScript code executes within their browsers (Zammad Advisory).

When exploited, the vulnerability allows malicious JavaScript code to execute within the browser context of any user who opens a specially crafted link to the uploaded file, provided they have an active Zammad session. This could potentially lead to session hijacking, data theft, or other malicious actions performed in the context of the victim's session (Zammad Advisory).

The vulnerability has been fixed in Zammad versions 3.2.1 and 3.3.0. Users are recommended to upgrade to these or newer versions. Updates can be obtained through the official Zammad website, FTP server, or through OS package managers (Zammad Advisory).