CVE-2026-50056 Zimbra Collaboration Suite - Privilege Escalation

Zimbra Collaboration Suite 10.1.16 and 10.1.21 contain a local privilege escalation caused by unrestricted JVM arguments in the zmmailboxdmgr launcher, letting local zimbra users execute commands as root, exploit requires local command execution as zimbra and interrupting mailboxd during restart.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.22% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026
Weakness
CWE-88

Vendor fix

Update to a version later than 10.1.21 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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