CVE-2026-33368
Medium
Description
Zimbra Collaboration Suite (ZCS) 10.0 and 10.1 contains a reflected cross-site scripting (XSS) vulnerability in the Classic Webmail REST interface (/h/rest). The application fails to properly sanitize user-supplied input, allowing an unauthenticated attacker to inject malicious JavaScript into a crafted URL. When a victim user accesses the link, the injected script executes in the context of the Zimbra webmail application, which could allow the attacker to perform actions on behalf of the victim.
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 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.