AEGLIX vulnerability intelligence
CVE-2025-66376
HIGH · CVSS 7.2 · Analyzed
Published: 2026-01-05 · Updated: 2026-10-07 · Source: NVD
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Vulnerability overview
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.
Severity and scoring
- CVSS score
- 7.2 · HIGH
- CVSS version
- 3.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Weaknesses
- CWE-79
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Listed in CISA’s Known Exploited Vulnerabilities catalog.
- Affected product
- Synacor · Zimbra Collaboration Suite (ZCS)
- Added to catalog
- 2026-03-18
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA remediation due date
- 2026-04-01
CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
From (inclusive): 10.0.0
Before (exclusive): 10.0.18
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
From (inclusive): 10.1.0
Before (exclusive): 10.1.13
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- https://wiki.zimbra.com/wiki/Security_Center
Release Notes · Vendor Advisory
- https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes
Release Notes
- https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes
Release Notes
- https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
Product
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376
US Government Resource