CVE-2025-66376
high · 7.2Actively exploitedOn the CISA Known Exploited Vulnerabilities catalog
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Added 2026-03-18Remediation due 2026-04-01
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.
7.2
CVSS
19.6%
EPSS (exploit prob.)
97th
EPSS percentile
2026-01-05
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weaknesses
CWE-79
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| synacor | zimbra_collaboration_suite | >= 10.0.0, < 10.0.18 |
| synacor | zimbra_collaboration_suite | >= 10.1.0, < 10.1.13 |
Check a specific version with /api/v1/cve/match.
References
- https://wiki.zimbra.com/wiki/Security_Center
- https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes
- https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes
- https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2025-66376