An attendee authentication vulnerability in the email calendar processing of Zimbra Collaboration Suite (ZCS) allows an unauthenticated sender to forge another attendee's response to an existing meeting. Zimbra passes a null sender identity when processing iCalendar REPLY components, causing the attendee authorization filter to be skipped. An attacker who knows the meeting UID, organizer address and attendee address can send a non-outdated reply that changes the attendee's participation status in the organizer's calendar. The change occurs automatically during delivery without organizer or attendee 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
- StatusUndergoing Analysis → PublishedNVD modified 2026-10-28 20:02
- StatusPublished → Undergoing AnalysisNVD modified 2026-10-28 20:18
- StatusAwaiting Analysis → PublishedNVD modified 2026-10-23 13:18
- StatusPublished → Awaiting AnalysisNVD modified 2026-10-23 16:44
- StatusReceived → PublishedNVD modified 2026-10-23 13:18
- StatusPublished → ReceivedNVD modified 2026-10-23 14:17
- First seenCVSS 5.3 · zimbraNVD modified 2026-10-23 13:18
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.