Synacor Zimbra Collaboration
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By the Year
In 2026 there have been 2 vulnerabilities in Synacor Zimbra Collaboration with an average score of 5.3 out of ten.
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 2 | 5.30 |
It may take a day or so for new Zimbra Collaboration vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.
Recent Synacor Zimbra Collaboration Security Vulnerabilities
Zimbra Classic UI XSS via From header (v10.1.21 fix)
CVE-2026-66912
5.3 - Medium
- October 29, 2026
Zimbra is vulnerable to Stored Cross-Site Scripting (XSS) via the From email header during HTML reply composition in Classic UI. Due to insufficient sanitization of the From header value, a remote attacker can send a crafted email containing a malicious From header with an embedded JavaScript payload. When the victim opens the message in Classic UI and clicks Reply while composing in HTML mode with reply headers disabled, the unsanitized From header content is rendered as HTML and the JavaScript payload executes in the victim's browser, potentially allowing the attacker to steal session information or perform actions on behalf of the victim. This issue was fixed in version 10.1.21
XSS
Zimbra XSS via Content-Location header (before 10.1.21)
CVE-2026-66911
5.3 - Medium
- October 29, 2026
Zimbra is vulnerable to stored cross-site scripting (XSS) via the Content-Location MIME header in email attachments. Due to lack of sanitization of the Content-Location header, an attacker can set it to a javascript: URI. An unauthenticated remote attacker can send a crafted email to a victim; when the victim opens the email in the Zimbra web interface and clicks the attachment name, the JavaScript payload executes in the victim's browser context. This issue was fixed in version 10.1.21
XSS
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