CVE-2025-66376

MediumCVSS 6.1/10Known exploited (CISA KEV)Last modified Oct 7, 2026

Description

Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

No affected versions have been published.

Timeline

Published: Jan 5, 2026
Last modified: Oct 7, 2026
Added to CISA KEV: Mar 18, 2026
NVD status: Analyzed

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