CVE-2026-93628

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...

CVE-2026-93628 Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar REPLY Attendee Response

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...

CVE-2026-93628

The Zimbra Collaboration Suite (ZCS) version 10.1.16 and 10.1.21 are vulnerable to an authentication bypass in the email calendar processing. The root cause is that the system passes a null sender identity when processing iCalendar REPLY components, which leads to the attendee authorization filte...

iDefense Security Advisory 09.26.11: Novell GroupWise iCal RRULE Weekday Recurrence Heap Overflow Vulnerability

iDefense Security Advisory 09.26.11 http://labs.idefense.com/intelligence/vulnerabilities/ Sep 26, 2011 I. BACKGROUND GroupWise is Novell's messaging platform, and includes support for email, calendaring, and instant messaging. More information is available at the following website:...

iDefense Security Advisory 09.26.11: Novell GroupWise iCal RRULE ByWeekNo Memory Corruption Vulnerability

iDefense Security Advisory 09.26.11 http://labs.idefense.com/intelligence/vulnerabilities/ Sep 26, 2011 I. BACKGROUND GroupWise is Novell's messaging platform, and includes support for email, calendaring, and instant messaging. More information is available at the following website:...