CVE-2026-93629

An organizer authentication vulnerability in Zimbra Collaboration Suite ZCS allows an unauthenticated email sender to insert calendar invitations attributed to another user. The email delivery path permits external invitations but does not verify that the message sender is authorized to use the...

EUVD-2026-108965

An organizer authentication vulnerability in Zimbra Collaboration Suite ZCS allows an unauthenticated email sender to insert calendar invitations attributed to another user. The email delivery path permits external invitations but does not verify that the message sender is authorized to use the...

EUVD-2026-108963

An organizer authentication vulnerability in the email calendar processing of Zimbra Collaboration Suite ZCS allows an unauthenticated sender to cancel or modify an existing meeting in a recipient's calendar. Zimbra accepts iCalendar CANCEL and REQUEST components without verifying that the email...