CVE-2026-93637
Zimbra Collaboration Suite GraphQL Batched Authentication Bypasses Pre-Auth Rate Limiting
- State
- Published
- Severity
- 3.7 Low
- Published
- Oct 14, 2026
- Updated
- Oct 16, 2026
- Reserved
- Sep 18, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N | rapid7 |
Weaknesses
- CWE-307 Improper restriction of excessive authentication attempts
Affected Products
| Product | Versions |
|---|---|
Zimbra Collaboration SuiteZimbra |
|
References
- https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1third-party-advisory
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