CVE-2026-33371

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Summary

CVECVE-2026-33371
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-20 14:16:16 UTC
Updated2026-04-01 15:35:47 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.000440000 probability, percentile 0.135400000 (date 2026-04-01)

Problem Types: CWE-611 | n/a | CWE-611 CWE-611 Improper Restriction of XML External Entity Reference

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Synacor Zimbra Collaboration Suite All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy [email protected] wiki.zimbra.com Product
wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16 [email protected] wiki.zimbra.com Release Notes
wiki.zimbra.com/wiki/Security_Center [email protected] wiki.zimbra.com Vendor Advisory, Release Notes
wiki.zimbra.com/wiki/Zimbra_Security_Advisories [email protected] wiki.zimbra.com Vendor Advisory
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