vulnerability
Zimbra Collaboration: CVE-2025-66376: Collaboration: Cross-site Scripting
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:N/AC:L/Au:N/C:P/I:P/A:N) | Jan 5, 2026 | Jan 6, 2026 | Mar 25, 2026 |
Severity
6
CVSS
(AV:N/AC:L/Au:N/C:P/I:P/A:N)
Published
Jan 5, 2026
Added
Jan 6, 2026
Modified
Mar 25, 2026
Description
Patched a stored XSS vulnerability in the Classic UI where attackers could abuse CSS @import directives in email HTML.
Solution
zimbra-collaboration-upgrade-latest
References
- CWE-79
- CVE-2025-66376
- https://attackerkb.com/topics/CVE-2025-66376
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-0850
- https://wiki.zimbra.com/wiki/Security_Center
- https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes
- https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes
- https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.