CVE-2026-33371

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-33371
An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. An XML External Entity (XXE) vulnerability exists in the Zimbra Exchange Web Services (EWS) SOAP interface due to improper handling of XML input. An authenticated attacker can submit crafted XML data that is processed by an XML parser with external entity resolution enabled. Successful exploitation may allow disclosure of sensitive local files from the server.

4.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://wiki.zimbra.com/wiki/Security_Center Vendor Advisory Release Notes
https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16#Security_Fixes Release Notes
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy Product
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories Vendor Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
History

01 Apr 2026, 15:35

Type Values Removed Values Added
CPE cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
References () https://wiki.zimbra.com/wiki/Security_Center - () https://wiki.zimbra.com/wiki/Security_Center - Vendor Advisory, Release Notes
References () https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16#Security_Fixes - () https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16#Security_Fixes - Release Notes
References () https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy - () https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy - Product
References () https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories - () https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories - Vendor Advisory
Summary
  • (es) Se descubrió un problema en Zimbra Collaboration (ZCS) 10.0 y 10.1. Existe una vulnerabilidad de entidad externa XML (XXE) en la interfaz SOAP de Zimbra Exchange Web Services (EWS) debido a un manejo inadecuado de la entrada XML. Un atacante autenticado puede enviar datos XML manipulados que son procesados por un analizador XML con la resolución de entidades externas habilitada. La explotación exitosa puede permitir la divulgación de archivos locales sensibles del servidor.
First Time Synacor zimbra Collaboration Suite
Synacor

23 Mar 2026, 14:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 4.3
CWE CWE-611

20 Mar 2026, 14:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-20 14:16

Updated : 2026-04-01 15:35

NVD link : CVE-2026-33371

Mitre link : CVE-2026-33371

CVE.ORG link : CVE-2026-33371

JSON object : View

Products Affected

synacor

  • zimbra_collaboration_suite
CWE
CWE-611

Improper Restriction of XML External Entity Reference