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CVE-2026-33371

Published: Mar 20, 2026Updated: Apr 1, 2026 Sources: CVE List NVD BDUCWE-611
4.3MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 85.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-611

Affected Products

synacor
commercial·US
zimbra collaboration suiteOn-premWeb App
Communications / email-server-client
Zimbra Inc.
commercial·US
Zimbra Collaboration SuiteMixed
Communications / email-server-client
and 1 more affected products View all →

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Collection
Initial Access
View detailed technique mapping

References

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
wiki.zimbra.com
https://wiki.zimbra.com/wiki/Security_Center
wiki.zimbra.com
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
wiki.zimbra.com
and 2 more references View all →

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