CVE Watch23 oct 2026

CVE-2026-93629

An organizer authentication vulnerability in Zimbra Collaboration Suite (ZCS) allows an unauthenticated email sender to insert calendar invi

CVSS

5.3

Medio

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 23 oct 2026 · Última mod.: 23 oct 2026 · CWE-290

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

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 iCalendar ORGANIZER identity. When automatic invitation insertion is enabled, a crafted REQUEST component creates an event containing attacker-selected meeting details and reminders under a forged organizer without recipient interaction. No corresponding event is created in the claimed organizer's calendar. ZCS 10.1.16 and 10.1.21 are affected.

Referencias oficiales

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