Is CVE-2026-73571 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-73571?

CVE-2026-73571 has a CVSS v3 severity of LOW (3.1).

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CVE-2026-73571

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.