CVE-2026-93640 Zimbra Collaboration Suite - Privilege Escalation

Zimbra Collaboration Suite (ZCS) 10.1.16 and 10.1.21 dnscache packages contain a local privilege escalation caused by unrestricted arguments to zmunbound forwarding to Unbound, letting local attackers access root files and modify configurations, exploit requires local Unix zimbra account.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation, Information Disclosure, Data Tampering, Denial Of Service
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-732

Vendor fix

Update dnscache package to a version later than 10.1.21 or apply vendor patches.

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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