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CVE-2026-50053— Zimbra Collaboration Suite RestFilter Request Attribute Override via Unauthenticated URL Parameters

Quick assessment

Affected
Zimbra Zimbra Collaboration Suite
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.

Zimbra Collaboration Suite (ZCS) 中存在一个请求属性覆盖漏洞，该漏洞允许未经身份验证的请求访问 路径，从而向本应仅由受信任的内部分发机制使用的 Servlet 属性注入数据。RestFilter 会将 URL 参数（用于指定身份验证令牌、目标账户、目标项目以及分发状态）复制到请求属性中，这些属性随后被经典 Web 客户端（Classic Web Client）所消费。若与 ZCS 10.1.16 版本中的 CVE-2026-10632 漏洞结合利用，攻击者可提供其自身的合法令牌和文档

CVSS 8.7 · High
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I. Basic Information for CVE-2026-50053

Vulnerability Information
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Vulnerability Title
Zimbra Collaboration Suite RestFilter Request Attribute Override via Unauthenticated URL Parameters
Source: CVE Program / CVE List V5
Vulnerability Description
A request attribute override vulnerability in Zimbra Collaboration Suite (ZCS) allows unauthenticated requests to /h/* to populate servlet attributes intended for trusted internal dispatch. RestFilter copies URL parameters specifying an authentication token, target account, target item and dispatch state into the request attributes consumed by the Classic Web Client. Combined with CVE-2026-10632 on ZCS 10.1.16, this allows an attacker to supply their own valid token and document identifiers and execute JavaScript in another user's signed-in browser session. ZCS 10.1.17 blocks that XSS chain by changing the document renderer, but retains the request attribute override.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对关键状态数据的外部可控制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zimbra Zimbra Collaboration Suite 0 ~ 10.1.17 -

II. Public POCs for CVE-2026-50053

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III. Intelligence Information for CVE-2026-50053

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Vendor Advisories for CVE-2026-50053 (1)

Other References for CVE-2026-50053 (1)

Same Patch Batch · Zimbra · 2026-10-23 · 17 CVEs total

CVE-2026-10632 8.7 HIGH Zimbra Collaboration Suite Classic Web Client Reflected Cross-Site Scripting via Document
CVE-2026-93639 8.7 HIGH Zimbra Collaboration Suite Missing Authorization in ConfigureZimlet Enables Delegated Admi
CVE-2026-93640 7.8 HIGH Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted zmunbound Sudo Conf
CVE-2026-50056 7.8 HIGH Zimbra Collaboration Suite Local Privilege Escalation via zmmailboxdmgr JVM Argument Injec
CVE-2026-50057 7.8 HIGH Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted Postfix Sudo Permis
CVE-2026-93631 7.1 HIGH Zimbra Collaboration Suite OAuth Extension Cross-Site Request Forgery Enables Account Link
CVE-2026-115786 6.5 MEDIUM Zimbra Collaboration Suite Shared-File Mailbox Quota Accounting Error Enables Quota Exhaus
CVE-2026-93638 6.1 MEDIUM Zimbra Collaboration Suite Pre-Authentication Reflected Cross-Site Scripting via Login Pag
CVE-2026-93633 5.4 MEDIUM Zimbra Collaboration Suite Briefcase CSS Sanitization Bypass via Non-ASCII Stylesheet Char
CVE-2026-93629 5.3 MEDIUM Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar
CVE-2026-93627 5.3 MEDIUM Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar
CVE-2026-93628 5.3 MEDIUM Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar
CVE-2026-93630 4.3 MEDIUM Zimbra Collaboration Suite Email HTML Sanitizer Bypass via Hostname Canonicalization
CVE-2026-93634 4.3 MEDIUM Zimbra Collaboration Suite Cross-Account Authorization Bypass via Forged Shared-File Recor
CVE-2026-93636 4.3 MEDIUM Zimbra Collaboration Suite LDAP Filter Injection via Calendar Resource Attribute Name
CVE-2026-115785 4.3 MEDIUM Zimbra Collaboration Suite Data Source Test SMTP Command Injection via Unsanitized Email A

IV. Related Vulnerabilities

Same product: Zimbra Collaboration Suite
Same vendor: Zimbra
Same weakness: CWE-642

V. Comments for CVE-2026-50053

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