CVE-2026-93634
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
59/100
Published: 2026-10-23
Modified: 2026-10-28
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
None
I:
Low
A:
None
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.
Weakness Classification (1)
Affected Software (4)
| Vendor | Product | Version |
|---|---|---|
| Zimbra | Zimbra Collaboration Suite | 0 |
| Zimbra | Zimbra Collaboration Suite | 0 |
| synacor | zimbra_collaboration_suite | < 10.1.20 |
| synacor | zimbra_collaboration_suite | < 10.1.20 |
References & Advisories (2)
Vendor Advisory
Exploit
Third Party Advisory