Stored Cross-Site Scripting Vulnerability in Zimbra Collaboration by Zimbra
CVE-2026-33370

6.1MEDIUM

Key Information:

Vendor

Zimbra

Status
Zimbra Collaboration (ZCS)
Vendor
CVE Published:
20 March 2026

What is CVE-2026-33370?

A stored cross-site scripting vulnerability was identified in the Zimbra Briefcase feature of Zimbra Collaboration (ZCS) versions 10.0 and 10.1. This issue arises from the inadequate sanitization of uploaded file types, allowing attackers to embed malicious scripts in files shared publicly. When an unsuspecting user opens such a file, the embedded JavaScript can execute within their session context. This exploitation can potentially facilitate unauthorized actions or data exfiltration from the affected user's account.

References

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://wiki.zimbra.com/wiki/Security_Center
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosur...

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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