CVE Catalog

CVE-2026-50057

HighCVSS 7.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.27%

19th percentile - higher than 19% of all known CVEs

Summary

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 set a zimbra-controlled daemon_directory and invoke postfix set-permissions to execute their program as root. The Postfix configuration directory is also writable by zimbra.

Risk Assessment

A local attacker with the zimbra account on an MTA node can gain full root privileges and take over the mail server.

Recommendation

Update ZCS to the patched version. Restrict the sudo policy for Postfix commands and secure the Postfix configuration directory.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS