Vulnerability Details CVE-2026-33368
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 21.6%
CVSS Severity
CVSS v3 Score 6.1
References
Products affected by CVE-2026-33368
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.0
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.1
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.10
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.11
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.12
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.13
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.14
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.15
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.16
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.17
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.18
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.2
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.3
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.4
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.5
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.6
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.7
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.8
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.0.9
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.0
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.1
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.10
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.11
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.12
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.13
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.14
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.15
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.2
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.3
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.4
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.5
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.6
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.7
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.8
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cpe:2.3:a:synacor:zimbra_collaboration_suite:10.1.9