CVE Catalog

CVE-2026-50056

HighCVSS 7.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.34%

28th percentile - higher than 28% of all known CVEs

Summary

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 inadequately restricted JVM arguments; 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.

Risk Assessment

A local attacker with the zimbra account on a mailbox server can gain root privileges and take over the mail service, causing disruption.

Recommendation

Update ZCS to the patched version. Restrict the JVM arguments permitted via sudo for zmmailboxdmgr.

Related vulnerabilities

Original NVD description (English source)

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.

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