CVE-2026-93643 - Zimbra Collaboration Suite OnlyOffice Integration Path Traversal Leading to Remote Code Execution via Unauthenticated /downloadas Request

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CRITICAL

Zimbra Collaboration Suite OnlyOffice Integration Path Traversal Leading to Remote Code Execution via Unauthenticated /downloadas Request

Published Sep 25, 2026

9.8

CRITICAL

CVSS 3.1

EPSS 0.96%

Description

When OnlyOffice/Document Editing is available, an unauthenticated remote attacker with access to an existing supported public Briefcase document can abuse unsigned save fields to perform path-traversal writes and execute commands as zimbra.

Affected products

Vendor Zimbra Product Zimbra Collaboration Suite (ZCS) Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <10.1.21

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Zimbra

Zimbra Collaboration Suite (ZCS)

unaffected

Version	Status	Constraints
0	affected	<10.1.21

Remediation

No remediation recorded yet.

Weaknesses (2)

CWE-22

Path Traversal

CWE-863

Incorrect Authorization

References (1)

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
vendor-advisory

Link	Providers	Tags
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories		vendor-advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner rapid7

Published Sep 25, 2026

Updated Sep 26, 2026

Reserved Sep 18, 2026

Link CVE-2026-93643

CISA Vulnrichment

Updated Sep 25, 2026

NVD

Status Received

Modified Sep 25, 2026

Link CVE-2026-93643

Red Hat

Severity n/a

Public date n/a

Links CVE-2026-93643