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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Zimbra Collaboration unaffected
Version Status Constraints
0 affected < 10.1.17

No data.

No data.

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No data.

Project Subscriptions

Vendors Products
Zimbra Subscribe
Collaboration Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://wiki.zimbra.com/wiki/Security_Center cve-icon cve-icon
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories cve-icon cve-icon
History

Thu, 13 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
Title Impersonation via Bypassed Delegated Email Sending in Zimbra Collaboration

Thu, 13 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 13 Aug 2026 16:00:00 +0000

Type Values Removed Values Added
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. 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.

Thu, 13 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
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.
First Time appeared Zimbra
Zimbra collaboration
Weaknesses CWE-863
CPEs cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*
Vendors & Products Zimbra
Zimbra collaboration
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-08-13T15:57:39.948Z

Reserved: 2026-08-12T21:49:11.961Z

Link: CVE-2026-73571

cve-icon Vulnrichment

Updated: 2026-08-13T15:57:34.898Z

cve-icon NVD

Status : Received

Published: 2026-08-13T16:19:06.150

Modified: 2026-08-13T16:19:06.150

Link: CVE-2026-73571

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T16:30:03Z

Weaknesses