Zimbra 10.1.16 & earlier: Auth Bypass via SOAP SaveDraftRequest
CVE-2026-73571 Published on August 13, 2026
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.
Vulnerability Analysis
CVE-2026-73571 can be exploited with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-73571 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-73571
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Affected Versions
Zimbra Collaboration:- Before 10.1.17 is affected.