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Servers and applications

CVE-2026-93634

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…

Severity
Medium 4.3
Published
23 Oct 2026
Last changed
28 Oct 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
Zimbra CollaborationServers and applications · cpe:a:synacor:zimbra_collaboration_suite
  • Every version up to 10.1.20

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-93634
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-93634