Is CVE-2026-50057 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-50057 being exploited in the wild.

How severe is CVE-2026-50057?

High severity, with a CVSS score of 7.8, published 23 October 2026.

Which products and versions are affected?

Zimbra Collaboration Suite 10.1.16, 10.1.21.

Is there a fix for CVE-2026-50057?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-50057 attacked?

It is attacked with local access, in a hosted service.

Am I affected by CVE-2026-50057?

Check whether you run Zimbra Collaboration Suite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-50057: Zimbra Collaboration Suite MTA local privilege escalation

CVE-2026-50057 · Severity: high · CVSS 7.8 · Published 2026-10-23

Zimbra Collaboration Suite (ZCS) MTA, a self-hosted email and collaboration platform, contains a local privilege escalation flaw in the Postfix mail transfer agent. An attacker with local command execution as the zimbra user can exploit a misconfigured sudo policy to execute arbitrary commands as root, gaining complete control of the mail server and access to all email data and credentials stored on it.

Technologies: Zimbra Collaboration Suite. Vendors: Zimbra.

Quick answers

Is CVE-2026-50057 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-50057 being exploited in the wild.
How severe is CVE-2026-50057?: High severity, with a CVSS score of 7.8, published 23 October 2026.
Which products and versions are affected?: Zimbra Collaboration Suite 10.1.16, 10.1.21.
Is there a fix for CVE-2026-50057?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-50057 attacked?: It is attacked with local access, in a hosted service.
Am I affected by CVE-2026-50057?: Check whether you run Zimbra Collaboration Suite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability exists in the sudo policy that allows the zimbra account to run Postfix administration commands (postfix set-permissions) without password and without argument restrictions. An attacker can manipulate the Postfix configuration (which is writable by zimbra) to point to an attacker-controlled daemon_directory, then invoke postfix set-permissions to execute a malicious post-install script as root. Exploitation requires prior local command execution as the zimbra user on an MTA node.

Affected products

Zimbra Collaboration Suite 10.1.16, 10.1.21

Timeline

2026-10-23: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.