CVE-2025-66376
At a glance
- Severity
- HIGH 7.2
- Exploitation
- Known exploited (CISA KEV) · added 2026-03-18
Exploited per ENISA since 2026-03-18 - EPSS
- EPSS 20.23 % · percentile 97 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- mitre
- NVD status
- Analyzed
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.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N | mitre |
| CVSS 3.1 | HIGH 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N | NVD · cve@mitre.org (Secondary) |
| CVSS 3.1 | MEDIUM 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | NVD · nvd@nist.gov (Primary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2026-0850
- GCVE · GCVE-0-2025-66376
CERT-FR advisories
- CERTFR-2025-AVI-0970 — Multiples vulnérabilités dans Synacor Zimbra Collaboration · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*≥ 10.0.0 < 10.0.18cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*≥ 10.1.0 < 10.1.13
Affected products
| Product | Versions |
|---|---|
| Zimbra · Collaboration | affected 10.0 < 10.0.18 ; affected 10.1 < 10.1.13 |
References
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- https://wiki.zimbra.com/wiki/Security_Center
- https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
- https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes
- https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| CISA Known Exploited Vulnerabilities | CC0 1.0 |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |