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CVE-2026-93634 Details

Description

A cross-account authorization vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user to insert forged shared-file records into another user's mailbox through FileSharedWithMeRequest. The request bypasses delegated-account authorization and accepts attacker-selected file metadata, owner identifiers and declared sizes without validating a corresponding document share. An attacker can plant entries attributed to another real local account without that account sharing a document. No victim interaction is required. ZCS 10.1.16 and 10.1.20 are affected.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories	[email protected]	Vendor Advisory
https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/	[email protected]	ExploitThird Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-639	Authorization Bypass Through User-Controlled Key	[email protected]

Affected Products

Product	Versions
synacor zimbra collaboration suite	<= 10.1.20
CPE cpe:2.3:a:synacor:zimbra_collaboration_suite:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 28, 2026	Initial Analysis	[email protected]
Oct 28, 2026	CVE Modified	CISA-ADP
Oct 23, 2026	New CVE Received	[email protected]