CVE-2026-93643

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

State: Published
Severity: 9.8 Critical
Published: Sep 25, 2026
Updated: Sep 26, 2026
Reserved: Sep 18, 2026

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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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	rapid7

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
Zimbra Collaboration Suite (ZCS)Zimbra	before 10.1.21Affected

References

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisoriesvendor-advisory

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