MEDIUM 5.3 NVD
CVE-2026-66911
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-
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
References
- https://cert.pl/en/posts/2026/10/CVE-2026-66911
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
This medium severity vulnerability with a CVSS score of 5.3 was published on 2026-10-29 via NVD.
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