Zimbra Collaboration Suite up to 10.1.21 Passwordless Sudo Interface zmmailboxdmgr privileges management

Summaryinfo

A vulnerability described as very critical has been identified in Zimbra Collaboration Suite up to 10.1.21. This vulnerability affects unknown code of the file zmmailboxdmgr of the component Passwordless Sudo Interface. The manipulation results in privileges management. This vulnerability is cataloged as CVE-2026-50056. The attack must be initiated from a local position. There is no exploit available.

Detailsinfo

A vulnerability classified as very critical has been found in Zimbra Collaboration Suite up to 10.1.21. Affected is an unknown code block of the file zmmailboxdmgr of the component Passwordless Sudo Interface. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at wiki.zimbra.com. This vulnerability is traded as CVE-2026-50056 since 06/03/2026. The exploitability is told to be easy. Local access is required to approach this attack. Additional levels of successful authentication are needed for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/23/2026). This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Groupware Software

Vendor

• Zimbra

Name

• Collaboration Suite

Version

• 10.1.0
• 10.1.1
• 10.1.2
• 10.1.3
• 10.1.4
• 10.1.5
• 10.1.6
• 10.1.7
• 10.1.8
• 10.1.9
• 10.1.10
• 10.1.11
• 10.1.12
• 10.1.13
• 10.1.14
• 10.1.15
• 10.1.16
• 10.1.17
• 10.1.18
• 10.1.19
• 10.1.20
• 10.1.21

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