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CVE-2026-50055— Zimbra Collaboration Suite Sieve Notify Filter Action Bypasses Mail Forwarding Restriction via Variable Expansion

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 中存在一个策略执行缺陷，允许经过身份验证的用户绕过已禁用的邮件转发功能。该用户可利用 Sieve notify 动作，将电子邮件的内容和标头副本发送到任意指定地址。

CVSS 6.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zimbra Zimbra Collaboration Suite < 10.1.20 affected
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I. Basic Information for CVE-2026-50055

Vulnerability Information
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Vulnerability Title
Zimbra Collaboration Suite Sieve Notify Filter Action Bypasses Mail Forwarding Restriction via Variable Expansion
Source: CVE Program / CVE List V5
Vulnerability Description
A policy-enforcement flaw in Zimbra Collaboration Suite allows an authenticated user to bypass disabled mail forwarding by using a Sieve notify action to send copies of email content and headers to an arbitrary address.
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
授权机制不正确
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-2026-50055

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III. Intelligence Information for CVE-2026-50055

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Vendor Advisories for CVE-2026-50055 (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-2026-10631 6.5 MEDIUM Zimbra Collaboration Suite EWS Extension Authorization Bypass via Crafted Composite Folder

IV. Related Vulnerabilities

Same product: Zimbra Collaboration Suite
Same vendor: Zimbra
Same weakness: CWE-863

V. Comments for CVE-2026-50055

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