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

Quick assessment

Affected
Zimbra Zimbra Collaboration Suite (ZCS)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

当 OnlyOffice/文档编辑功能可用时，未经身份验证的远程攻击者若能访问一个现有的受支持的公共 Briefcase 文档，便可滥用未签名的保存字段实现路径遍历写入，并以 zimbra 用户身份执行命令。

CVSS 9.8 · Critical EPSS 0.96% · P60

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zimbra Zimbra Collaboration Suite (ZCS) < 10.1.21 affected
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I. Basic Information for CVE-2026-93643

Vulnerability Information
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Vulnerability Title
Zimbra Collaboration Suite OnlyOffice Integration Path Traversal Leading to Remote Code Execution via Unauthenticated /downloadas Request
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zimbra Zimbra Collaboration Suite (ZCS) 0 ~ 10.1.21 -

II. Public POCs for CVE-2026-93643

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III. Intelligence Information for CVE-2026-93643

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Vendor Advisories for CVE-2026-93643 (1)

Same Patch Batch · Zimbra · 2026-09-25 · 4 CVEs total

CVE-2026-93642 9.3 CRITICAL Zimbra Collaboration Suite Modern Web Client Stored Cross-Site Scripting via Forged Share
CVE-2026-93647 9.3 CRITICAL Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Crafted Cale
CVE-2026-93641 9.3 CRITICAL Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Forged Share

IV. Related Vulnerabilities

Same product: Zimbra Collaboration Suite (ZCS)
Same vendor: Zimbra
Same weakness: CWE-22

V. Comments for CVE-2026-93643

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