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CVE-2026-93627

5.3 medium SSVC exploitation: none Published
NVD · CVE.org

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 sender is authorized to act as the supplied organizer. An attacker who knows the meeting UID and organizer address can supply a non-outdated sequence number to move the recipient's meeting to Trash or replace its details. Processing occurs automatically during email delivery without recipient interaction. ZCS 10.1.16 and 10.1.21 are affected.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 7

  1. StatusUndergoing Analysis → PublishedNVD modified 2026-10-28 20:02
  2. StatusPublished → Undergoing AnalysisNVD modified 2026-10-28 20:18
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-23 13:17
  4. StatusPublished → Awaiting AnalysisNVD modified 2026-10-23 16:44
  5. StatusReceived → PublishedNVD modified 2026-10-23 13:17
  6. StatusPublished → ReceivedNVD modified 2026-10-23 14:17
  7. First seenCVSS 5.3 · zimbraNVD modified 2026-10-23 13:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 2