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CVE-2026-10631— Zimbra Collaboration Suite EWS Extension Authorization Bypass via Crafted Composite Folder/Item Identifier

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.

在 Zimbra Collaboration Suite 10.1.0 至 10.1.19 版本的 EWS（Exchange Web Services）FindItem 处理程序中存在授权绕过漏洞。该漏洞允许启用了 EWS 的认证用户，在没有共享或委托授权的情况下，读取任意本地账户的完整邮箱项目，包括原始 MIME 内容和附件。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zimbra Zimbra Collaboration Suite < 10.1.20 affected
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I. Basic Information for CVE-2026-10631

Vulnerability Information
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Vulnerability Title
Zimbra Collaboration Suite EWS Extension Authorization Bypass via Crafted Composite Folder/Item Identifier
Source: CVE Program / CVE List V5
Vulnerability Description
An authorization bypass in the EWS FindItem handler of Zimbra Collaboration Suite 10.1.0 through 10.1.19 allows an authenticated user with EWS enabled to read complete mailbox items, including raw MIME and attachments, from arbitrary local accounts without a share or delegation grant.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zimbra Zimbra Collaboration Suite 0 ~ 10.1.20 -

II. Public POCs for CVE-2026-10631

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III. Intelligence Information for CVE-2026-10631

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Vendor Advisories for CVE-2026-10631 (1)

Same Patch Batch · Zimbra · 2026-10-08 · 3 CVEs total

CVE-2026-50054 7.1 HIGH Zimbra Collaboration Suite GrantRightsRequest SOAP Handler Allows Self-Granting of Undocum
CVE-2026-50055 6.5 MEDIUM Zimbra Collaboration Suite Sieve Notify Filter Action Bypasses Mail Forwarding Restriction

IV. Related Vulnerabilities

Same product: Zimbra Collaboration Suite
Same vendor: Zimbra
Same weakness: CWE-639

V. Comments for CVE-2026-10631

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