CVE-2026-73571

MediumCVSS 4.3/10Last modified Aug 28, 2026

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.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-863

Affected software

Vendor	Product	Versions
Zimbra	Collaboration	< 10.1.17

References

https://wiki.zimbra.com/wiki/Security_CenterVendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory

Timeline

Published: Aug 13, 2026
Last modified: Aug 28, 2026
NVD status: Analyzed

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