Vulnerability detail

Enriched intelligence for a single CVE

7.2

CVSS
High

CVE-2025-66376

PUBLISHED

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...

1 day faster than CISA KEV

Exploited in the wild Remote Low complexity No user interaction

Vendor: Zimbra
Product: Collaboration
Published: Jan 05, 2026
EPSS: 10.9% · 94% pctl

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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.

cisa

Weaknesses (CWE)

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS scores

CVSS v3.1 7.2 High

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

Exploitation status

Exploited in the wild

Recorded 2026-06-01 12:10:26 UTC · CVE

References

Known exploited vulnerability sources

Catalogues that list this CVE as a known exploited vulnerability.

Source	Added
CVE First	2026-06-01 12:10 UTC
CISA	2026-06-02 14:02 UTC

Timeline

CVE ID Reserved

2025-11-28 00:00 UTC
CVE Published to Public

2026-01-05 00:00 UTC
Added to KEVIntel

2026-06-01 12:10 UTC
KEV confirmed by CISA

2026-06-02 14:02 UTC