CVE-2026-50054 Zimbra Collaboration Suite - Authorization Bypass

Zimbra Collaboration Suite contains an authorization flaw in GrantRightsRequest, letting authenticated attackers grant loginAs rights to other local accounts, enabling persistent mailbox access and mail-sending authority.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-269

Vendor fix

Update to the latest version with the authorization flaw fixed.

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

← All CVEs