Is CVE-2026-93634 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-93634?

CVE-2026-93634 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-93634

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.