CVE-2026-93637— Zimbra Collaboration Suite GraphQL Batched Authentication Bypasses Pre-Auth Rate Limiting
Quick assessment
Affected
Zimbra Zimbra Collaboration Suite
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Zimbra Collaboration Suite 10.1.0 至 10.1.21 版本中存在一个身份认证速率限制绕过漏洞。该漏洞允许未认证的攻击者通过 GraphQL 接口反复进行密码猜测，而不会增加 Zimbra 基于源 IP 地址的失败计数机制。GraphQL 的别名（aliases）功能使得攻击者可以在单个 HTTP 请求中发起多次身份认证尝试，从而绕过速率限制保护。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1110.004 · Credential StuffingAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Zimbra | Zimbra Collaboration Suite | ≤ 10.1.21 |
affected |
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I. Basic Information for CVE-2026-93637
Vulnerability Information
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Vulnerability Title
Zimbra Collaboration Suite GraphQL Batched Authentication Bypasses Pre-Auth Rate Limiting
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Zimbra | Zimbra Collaboration Suite | 0 ~ 10.1.21 | - |
|
II. Public POCs for CVE-2026-93637
| # | POC Description | Source Link | Shenlong Link |
|---|
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Security Blog Posts for CVE-2026-93637 (1)
-
From One Account to Every Mailbox: Breaking Zimbra's Identity Boundaries (Part 1) third-party-advisory
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V. Comments for CVE-2026-93637
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