CVE-2026-50054
Zimbra Collaboration Suite GrantRightsRequest SOAP Handler Allows Self-Granting of Undocumented loginAs Mailbox Delegation Right
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
An authorization flaw in Zimbra Collaboration Suite’s GrantRightsRequest allows an attacker with access to an authenticated account to grant another local account the loginAs right, creating persistent mailbox access and mail-sending authority that survives password changes and session expiry.
| CWE | CWE-269 |
| Vendor | zimbra |
| Product | zimbra collaboration suite |
| Published | Oct 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
Zimbra / Zimbra Collaboration Suite
0 < 10.1.20
References
Credits
Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7