Vulnerability Description
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
Related Weaknesses (CWE)
References
- https://cert.pl/en/posts/2026/10/CVE-2026-66911
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
FAQ
What is CVE-2026-66911?
CVE-2026-66911 is a documented vulnerability. 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 ...
How severe is CVE-2026-66911?
CVSS scoring is not yet available for CVE-2026-66911. Check NVD for updates.
Is there a patch for CVE-2026-66911?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.