Is CVE-2025-66376 in the CISA KEV catalog?

Yes. CVE-2025-66376 is on the CISA Known Exploited Vulnerabilities list, added 2026-03-18.

What is the CVSS severity of CVE-2025-66376?

CVE-2025-66376 has a CVSS v3 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2025-66376?

CVE-2025-66376 has an EPSS score of 12.01% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2025-66376

HIGHCISA KEVEPSS 96th pctl

7.2

CVSS v3

NVD

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.

CWE-79Cross-Site Scripting (XSS)

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

12.01%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-04-01

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-18.