Critical Zimbra Stored XSS Vulnerability Discovered
In July 2026, Zimbra disclosed a critical stored cross-site scripting (XSS) vulnerability in its Classic Web Client, allowing attackers to execute arbitrary JavaScript by sending specially crafted emails. This flaw could lead to unauthorized access to mailbox information, session data, or account settings. Zimbra has released updates to address this issue and urges users to upgrade to version 10.1.19 for optimal protection. This incident underscores the persistent threat of XSS vulnerabilities in web applications, emphasizing the need for continuous security assessments and prompt patch management to mitigate potential exploits.
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