---
title: "CVE-2026-50056: Zimbra Collaboration Suite - Privilege Escalation"
description: "Zimbra Collaboration Suite 10.1.16 and 10.1.21 contain a local privilege escalation caused by unrestricted JVM arguments in the zmmailboxdmgr launcher, letting local zimbra users execute commands as root, exploit requires local command execution as zimbra and interrupting mailboxd during restart."
url: https://panop.io/threat-heartbeat/CVE-2026-50056/
---

# CVE-2026-50056 Zimbra Collaboration Suite - Privilege Escalation

Zimbra Collaboration Suite 10.1.16 and 10.1.21 contain a local privilege escalation caused by unrestricted JVM arguments in the zmmailboxdmgr launcher, letting local zimbra users execute commands as root, exploit requires local command execution as zimbra and interrupting mailboxd during restart.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.22% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-50056)

## Details

Type

Privilege Escalation

Impact

Privilege Escalation

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-88](https://cwe.mitre.org/data/definitions/88.html)

## Vendor fix

Update to a version later than 10.1.21 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-50056](https://nvd.nist.gov/vuln/detail/CVE-2026-50056)
- [https://wiki.zimbra.com/wiki/Zimbra\_Security\_Advisories](https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)
- [https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/](https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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