CVE Watch28 de out. de 2026

CVE-2026-93627

An organizer authentication vulnerability in the email calendar processing of Zimbra Collaboration Suite (ZCS) allows an unauthenticated sen

CVSS

5.3

Média

EPSS

0.3%

p19

KEV

—

Exploit Today

0-100

Publicado: 23 de out. de 2026 · Última mod.: 28 de out. de 2026 · CWE-290

EPSS · 30d

0.3%EPSS · 30 dias0.3%

2026-10-252026-11-07

Descrição técnica

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 An attacker who knows the meeting UID and organizer address can supply a non-outdated sequence number to move the recipient's meeting to Trash or replace its details.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.

Referências oficiais

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