CVE-2026-936344.3Medium
Zimbra Collaboration Suite Cross-Account Authorization Bypass via Forged Shared-File Records
Zimbra · Zimbra Collaboration Suite
Not in CISA KEVVendor fix available
0.2%probability of exploitation in the next 30 days
12th percentile
050100
Higher than 12% of scored CVEs
4.3MediumCVSS
LowMediumHighCrit.
DescriptionNVD
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.
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 27 Oct.
- Rapid7 Discloses 17 Flaws in Zimbra Collaboration SuiteSecurityOnline · first in our coverage · mentions it in passing
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