Zimbra ZCS 10 <10.0.18 / 10.1 <10.1.13 Classic UI XSS via CSS @import
CVE-2025-66376 Published on January 5, 2026
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.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2025-66376 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2025-66376
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Affected Versions
Zimbra Collaboration:- Version 10.0 and below 10.0.18 is affected.
- Version 10.1 and below 10.1.13 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.