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An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0 and 10.1. A stored cross-site scripting (XSS) vulnerability exists in the Classic Web Client due to insufficient sanitization of HTML content in ICS files. When a user views an e-mail message containing a malicious ICS entry, its embedded JavaScript executes via an ontoggle event inside a <details> tag. This allows an attacker to run arbitrary JavaScript within the victim's session, potentially leading to unauthorized actions such as setting e-mail filters to redirect messages to an attacker-controlled address. As a result, an attacker can perform unauthorized actions on the victim's account, including e-mail redirection and data exfiltration.

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Zimbra Collaboration Server 安全漏洞

Zimbra Collaboration Server（ZCS）是Zimbra公司的一套电子邮件和协作解决方案。该方案提供电子邮件、联系人、日历、文件共享、社交网络等功能。 Zimbra Collaboration Server 9.0版本、10.0版本和10.1版本存在安全漏洞，该漏洞源于Classic Web Client对ICS文件中的HTML内容清理不足，可能导致存储型跨站脚本攻击。

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