Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 13.5%
CVSS Severity
CVSS v3 Score 4.3
References
Products affected by CVE-2026-33371
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.0
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.1
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.10
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.11
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.12
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.13
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.14
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.15
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.16
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.17
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.18
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.2
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.3
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.4
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.5
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.6
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.7
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.8
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.9
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.0
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.1
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.10
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.11
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.12
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.13
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.14
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.15
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.2
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.3
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.4
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.5
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.6
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.7
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.8
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.9