CVE-2026-50057 Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted Postfix Sudo Permissions
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-50057?
CVE-2026-50057 is a high-severity vulnerability in Zimbra Collaboration Suite, published on 23 Oct 2026.
Official 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.
Weakness: CWE-732
Which versions are affected by CVE-2026-50057?
How do I fix CVE-2026-50057?
No fix has been published for CVE-2026-50057 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-50057 being exploited?
There is no known exploitation of CVE-2026-50057 in the wild and no public exploit code.
Sources
Also known as GHSA-h6p2-5x3j-hpj8.