Is CVE-2026-33371 actively exploited?

No active exploitation of CVE-2026-33371 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33371 be exploited remotely?

Yes. CVE-2026-33371 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33371?

CVE-2026-33371 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-33371

Published: March 20, 2026· Updated: Mar 24, 2026

4.3

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:5.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33371 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.