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CVE-2026-33370

Published: Mar 20, 2026Updated: Apr 1, 2026 Sources: CVE List NVD BDUCWE-79
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.2%
Top 89.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A stored cross-site scripting (XSS) vulnerability exists in the Zimbra Briefcase feature due to insufficient sanitization of specific uploaded file types. When a user opens a publicly shared Briefcase file containing malicious scripts, the embedded JavaScript executes in the context of the user's session. This allows an attacker to run arbitrary scripts, potentially leading to data exfiltration or other unauthorized actions on behalf of the victim user.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-79

Affected Products

n/an/a
Zimbra Collaboration SuiteZimbra Inc.
Mixed
Communications / email-server-client
zimbra collaboration suitesynacor
On-premWeb App
Communications / email-server-client
zimbra inc.commercialUSCommunications
synacorcommercialUSCommunicationsaka synacor

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
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 →

Timeline

Published
Mar 20, 2026
Last Updated
Apr 1, 2026

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