CVE-2026-50056
HIGH
7,8
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Description
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.
88
Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
DraftCommon Consequences
Security Scopes Affected:
Confidentiality
Integrity
Availability
Other
Potential Impacts:
Execute Unauthorized Code Or Commands
Alter Execution Logic
Read Application Data
Modify Application Data
Applicable Platforms
Languages:
Not Language-Specific, PHP
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/