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CVE-2026-50056— Zimbra Collaboration Suite Local Privilege Escalation via zmmailboxdmgr JVM Argument Injection

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 协作套件（ZCS）中的 启动程序存在一个本地提权漏洞，允许 Unix 用户 以 root 权限执行任意命令。该漏洞源于无密码的 sudo 接口对 JVM 参数缺乏充分限制。攻击者可以推迟 Jetty 的权限降级，注册一个 回调命令，并在启动阶段强制触发堆内存耗尽，从而在 JVM 仍以 root 身份运行时执行该命令。利用此漏洞需要在邮箱服务器上以 用户身份获得本地命令执行权限，并在恶意重启过程中中断 服务。受影响的版本包括 ZCS 10.1.16 和 10.1.21。

CVSS 7.8 · High

Possible ATT&CK Techniques 1 AI

T1068.004

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zimbra Zimbra Collaboration Suite ≤ 10.1.21 affected
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I. Basic Information for CVE-2026-50056

Vulnerability Information
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Vulnerability Title
Zimbra Collaboration Suite Local Privilege Escalation via zmmailboxdmgr JVM Argument Injection
Source: CVE Program / CVE List V5
Vulnerability Description
A local privilege escalation vulnerability in the zmmailboxdmgr launcher of Zimbra Collaboration Suite (ZCS) allows the Unix zimbra account to execute arbitrary commands as root. The passwordless sudo interface accepts JVM arguments that are not adequately restricted. An attacker can postpone Jetty's privilege drop, register an OnOutOfMemoryError command and force heap exhaustion during startup, causing the command to execute while the JVM still runs as root. Exploitation requires local command execution as zimbra on a mailbox server and interrupts mailboxd during the malicious restart. 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
参数注入或修改
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-2026-50056

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III. Intelligence Information for CVE-2026-50056

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Vendor Advisories for CVE-2026-50056 (1)

Other References for CVE-2026-50056 (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-2026-50057 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-88

V. Comments for CVE-2026-50056

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