CVE-2024-27443

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.

CVSS v3.1 NVD

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

24.61% chance of exploitation in the next 30 days, 98th percentile

CISA KEV

added 2025-05-19

Nuclei

medium · CWE-79

Published

2024-08-12

Updated

2025-10-21

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-27443.yaml

Security advisories

• https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes
• https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes

References

• CVE Record
• NVD entry