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.
Advisories

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Fixes

Solution

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Workaround

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History

Sun, 18 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Zimbra
Zimbra zimbra Collaboration Suite
Vendors & Products Zimbra
Zimbra zimbra Collaboration Suite

Sat, 17 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 14 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
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.
Title Zimbra Collaboration Suite GraphQL Batched Authentication Bypasses Pre-Auth Rate Limiting
Weaknesses CWE-307
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: rapid7

Published:

Updated: 2026-10-16T15:31:51.432Z

Reserved: 2026-09-18T12:22:38.558Z

Link: CVE-2026-93637

cve-icon Vulnrichment

Updated: 2026-10-16T15:29:24.418Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-14T17:20:21.430

Modified: 2026-10-16T19:55:59.740

Link: CVE-2026-93637

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-18T16:15:14Z

Weaknesses