CVE-2026-93637
Zimbra Collaboration Suite GraphQL Batched Authentication Bypasses Pre-Auth Rate Limiting
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
An authentication rate-limit bypass in Zimbra Collaboration Suite 10.1.0 through 10.1.21 allows unauthenticated attackers to make repeated password guesses through GraphQL without incrementing Zimbra’s source-IP failure counter. GraphQL aliases allow multiple authentication attempts in one HTTP request.
| CWE | CWE-307 |
| Vendor | zimbra |
| Product | zimbra collaboration suite |
| Published | Oct 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
Zimbra / Zimbra Collaboration Suite
0 ≤ 10.1.21
References
Credits
Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7