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Global data_breach Multiple sectors HIGH 42m Global vulnerability Government and Critical Infrastructure CRITICAL 49m Global vulnerability Multiple sectors CRITICAL 1h Global apt Financial Services, Government HIGH 1h Global insider Cross-sector CRITICAL 1h Global vulnerability Multiple sectors CRITICAL 2h Global vulnerability Information Technology / Software Infrastructure CRITICAL 2h Global data_breach Healthcare CRITICAL 2h Global malware Financial Services HIGH 2h Global vulnerability Technology/Software Development HIGH 2h Global data_breach Multiple sectors HIGH 42m Global vulnerability Government and Critical Infrastructure CRITICAL 49m Global vulnerability Multiple sectors CRITICAL 1h Global apt Financial Services, Government HIGH 1h Global insider Cross-sector CRITICAL 1h Global vulnerability Multiple sectors CRITICAL 2h Global vulnerability Information Technology / Software Infrastructure CRITICAL 2h Global data_breach Healthcare CRITICAL 2h Global malware Financial Services HIGH 2h Global vulnerability Technology/Software Development HIGH 2h Global data_breach Multiple sectors HIGH 42m Global vulnerability Government and Critical Infrastructure CRITICAL 49m Global vulnerability Multiple sectors CRITICAL 1h Global apt Financial Services, Government HIGH 1h Global insider Cross-sector CRITICAL 1h Global vulnerability Multiple sectors CRITICAL 2h Global vulnerability Information Technology / Software Infrastructure CRITICAL 2h Global data_breach Healthcare CRITICAL 2h Global malware Financial Services HIGH 2h Global vulnerability Technology/Software Development HIGH 2h
Vulnerabilities

CVE-2025-66376

Critical 🇺🇸 CISA KEV
Synacor Zimbra Collaboration Suite XSS Vulnerability via CSS @import Directives
Published: Mar 18, 2026  ·  Source: CISA_KEV
CVSS v3
9.8
🔗 NVD Official
📄 Description (English)

Synacor Zimbra Collaboration Suite (ZCS) — CVE-2025-66376
Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability in the Classic UI where attackers could abuse Cascading Style Sheets (CSS) @import directives in email HTML.

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.

🤖 AI Executive Summary

Synacor Zimbra Collaboration Suite contains a critical cross-site scripting vulnerability in the Classic UI that allows attackers to exploit CSS @import directives in email HTML. This vulnerability could enable unauthorized access to sensitive data and compromise email security for affected organizations.

📄 Description (Arabic)

تحتوي مجموعة Zimbra Collaboration Suite على ثغرة XSS حرجة في واجهة المستخدم الكلاسيكية حيث يمكن للمهاجمين استغلال توجيهات CSS @import المضمنة في HTML البريد الإلكتروني. يمكن لهذه الثغرة أن تؤدي إلى تنفيذ كود ضار وسرقة بيانات المستخدمين والجلسات الحساسة. يتطلب تطبيق التصحيحات الفورية أو إيقاف استخدام المنتج إذا لم تكن التصحيحات متاحة.

🤖 ملخص تنفيذي (AI)

Synacor Zimbra Collaboration Suite يحتوي على ثغرة حرجة في البرامج النصية عبر المواقع في واجهة المستخدم الكلاسيكية تسمح للمهاجمين باستغلال توجيهات CSS @import في HTML البريد الإلكتروني. قد تمكن هذه الثغرة الوصول غير المصرح به إلى البيانات الحساسة والتسبب في اختراق أمان البريد الإلكتروني.

🤖 AI Intelligence Analysis Analyzed: Apr 12, 2026 06:00
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: high
🏢 Affected Saudi Sectors
government banking telecom healthcare energy
⚖️ Saudi Risk Score (AI)
10.0
/ 10.0
🔧 Remediation Steps (English)
Apply vendor-provided security patches immediately. Implement input validation and output encoding for email HTML content. Disable or restrict CSS @import functionality in email processing. Monitor email traffic for suspicious CSS directives. Consider upgrading to patched versions or discontinuing use if patches are unavailable. Implement Web Application Firewall rules to block malicious CSS patterns.
🔧 خطوات المعالجة (العربية)
طبق تصحيحات الأمان المقدمة من المورد فوراً. نفذ التحقق من صحة المدخلات وترميز المخرجات لمحتوى HTML البريد الإلكتروني. عطل أو قيد وظيفة CSS @import في معالجة البريد الإلكتروني. راقب حركة البريد الإلكتروني للكشف عن توجيهات CSS المريبة. فكر في الترقية إلى إصدارات معدلة أو التوقف عن الاستخدام إذا لم تكن التصحيحات متاحة. نفذ قواعد جدار الحماية لتطبيقات الويب لحجب أنماط CSS الضارة.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.1.1 A.2.1 A.3.1 A.5.1
🔵 SAMA CSF
ID.RA-1 PR.DS-1 PR.DS-5 DE.CM-1
🟡 ISO 27001:2022
A.6.1.1 A.12.2.1 A.13.1.1 A.14.2.1
🔗 References & Sources 0
No references.
📊 CVSS Score
9.8
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.8
Exploit No
Patch ✗ No
CISA KEV🇺🇸 Yes
Published 2026-03-18
Source Feed cisa_kev
🇸🇦 Saudi Risk Score
10.0
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev cisa exploit-known
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