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CVE-2026-73571

Quick assessment

Affected
Zimbra Collaboration
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（ZCS）10.1.17 之前的版本中存在一个授权绕过漏洞，该漏洞源于委派邮件发送功能中的授权验证不当。经过身份验证的攻击者可以通过发送精心构造的 SOAP 请求，冒充其他用户发送邮件，而无需具备所需的委派权限或“以该用户身份发送邮件”（send-as）权限。此漏洞存在于 SaveDraftRequest SOAP 处理程序中。

CVSS 3.1 · Low EPSS 0.26% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zimbra Collaboration < 10.1.17 affected
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I. Basic Information for CVE-2026-73571

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper authorization validation in delegated email sending functionality. An authenticated attacker can send specially crafted SOAP requests to impersonate another user and send emails without possessing the required delegation or send-as permissions. This occurs in the SaveDraftRequest SOAP handler.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/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 Collaboration 0 ~ 10.1.17 -

II. Public POCs for CVE-2026-73571

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III. Intelligence Information for CVE-2026-73571

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Vendor Advisories for CVE-2026-73571 (2)

Same Patch Batch · Zimbra · 2026-08-13 · 7 CVEs total

CVE-2026-73570 8.9 HIGH Zimbra Collaboration 命令注入漏洞
CVE-2026-73576 6.3 MEDIUM Zimbra <10.1.17 OnlyOffice弱密钥生成致JWT伪造
CVE-2026-73572 6.1 MEDIUM Zimbra <10.1.17 存储型XSS漏洞
CVE-2026-73575 3.1 LOW ZCS<10.1.17 CSRF漏洞
CVE-2026-73573 3.1 LOW Zimbra Collaboration <10.1.17 路径穿越漏洞
CVE-2026-73574 3.1 LOW Zimbra<10.1.17经典Web客户端LFI漏洞

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-73571

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