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CVE-2026-50057— Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted Postfix Sudo Permissions

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) 的 MTA 组件中存在一个本地权限提升漏洞，允许 Unix 系统上的 zimbra 账户以 root 身份执行任意命令。已安装的 sudo 策略允许无需密码即可以 root 身份执行 Postfix 管理命令，且未对其参数进行限制。攻击者可以在 Postfix 配置中选择一个由 zimbra 控制的 daemon_directory，然后调用 postfix set-permissions 命令，从而诱导 Postfix 以 root 权限执行攻击者

CVSS 7.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zimbra Zimbra Collaboration Suite ≤ 10.1.21 affected
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I. Basic Information for CVE-2026-50057

Vulnerability Information
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Vulnerability Title
Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted Postfix Sudo Permissions
Source: CVE Program / CVE List V5
Vulnerability Description
A local privilege escalation vulnerability in the Zimbra Collaboration Suite (ZCS) MTA package allows the Unix zimbra account to execute arbitrary commands as root. The installed sudo policy permits passwordless root execution of Postfix administration commands without restricting their arguments. An attacker can select a zimbra-controlled daemon_directory in the Postfix configuration and invoke postfix set-permissions, causing Postfix to execute the attacker's post-install program as root. The Postfix configuration directory is also writable by zimbra, so restricting postconf alone does not remove the execution path. Exploitation requires local command execution as zimbra on an MTA node. ZCS 10.1.16 and 10.1.21 are affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-50057

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III. Intelligence Information for CVE-2026-50057

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Vendor Advisories for CVE-2026-50057 (1)

Other References for CVE-2026-50057 (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-2026-50053 8.7 HIGH Zimbra Collaboration Suite RestFilter Request Attribute Override via Unauthenticated URL P
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-2026-93631 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-732

V. Comments for CVE-2026-50057

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