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An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0. A Cross-Site Scripting (XSS) vulnerability exists in the CalendarInvite feature of the Zimbra webmail classic user interface, because of improper input validation in the handling of the calendar header. An attacker can exploit this via an email message containing a crafted calendar header with an embedded XSS payload. When a victim views this message in the Zimbra webmail classic interface, the payload is executed in the context of the victim's session, potentially leading to execution of arbitrary JavaScript code.
Reserved 2024-02-26 | Published 2024-08-12 | Updated 2025-05-21 | Assigner mitreDate added 2025-05-19 | Due date 2025-06-09
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7
wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39
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