Zimbra is urging customers to apply updates to address a critical security vulnerability impacting the Classic Web Client that could result in arbitrary code execution.

The vulnerability has been described as a case of stored cross-site scripting (XSS) that could allow specially crafted emails to execute malicious scripts in a user’s session. It has yet to be assigned a CVE identifier.

“The

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While cyberattacks against hospitals and clinics grew modestly in the first half of 2026, attacks on service providers and other healthcare businesses more than doubled.

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