Live › vulnerability › CVE-2024-27443
Go to dashboardZimbra Collaboration Suite's classic webmail interface has a cross-site scripting flaw in its CalendarInvite feature. A crafted calendar header in an email runs attacker-chosen JavaScript in the victim's browser session.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Synacor Zimbra Collaboration Suite (ZCS) | vendor | – | – |
| zimbra collaboration | vendor | >= 10.0.0, < 10.0.7 | 10.0.7 |
| zimbra collaboration | vendor | = 9.0.0 | – |
Unknown from the sources.
Apply the vendor mitigations per CISA guidance (vendor instructions not in sources); or discontinue use of the product if mitigations are unavailable.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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