CVE-2026-33370
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Synacor Zimbra Collaboration Suite
PublishedMar 20, 2026
First seenMar 20, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- synacor zimbra_collaboration_suite10.1.16 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| synacor zimbra_collaboration_suite | 10.0.0 ≤ v < 10.1.16 | 10.1.16 |
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