📄 Description (English)
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability — Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that might allow remote attackers to inject arbitrary web script or HTML.
🤖 AI Executive Summary
CVE-2018-6882 is a critical cross-site scripting (XSS) vulnerability in Synacor Zimbra Collaboration Suite (ZCS) that allows remote attackers to inject arbitrary web script or HTML via crafted email content. This vulnerability has known exploits available in the wild and has been added to CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation. Given Zimbra's widespread deployment as an enterprise email platform, this vulnerability poses significant risk to organizations relying on it for communications. A patch is available and should be applied immediately.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 11, 2026 09:36
🇸🇦 Saudi Arabia Impact Assessment
Zimbra Collaboration Suite is widely deployed across Saudi government agencies, educational institutions, and mid-size enterprises as a cost-effective email solution. Government entities regulated by NCA, healthcare organizations, and educational institutions are particularly at risk. This XSS vulnerability could enable attackers to steal session cookies, hijack email accounts, conduct phishing from trusted internal accounts, and exfiltrate sensitive communications. Saudi banking sector organizations under SAMA regulation and energy sector entities including ARAMCO contractors using Zimbra for internal communications face elevated risk of credential theft and lateral movement through compromised email sessions.
🏢 Affected Saudi Sectors
Government
Education
Healthcare
Banking
Energy
Telecommunications
Retail
⚖️ Saudi Risk Score (AI)
8.5
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all Zimbra Collaboration Suite instances in your environment and determine their version numbers.
2. Apply the latest Zimbra security patches immediately — upgrade to ZCS 8.8.15 Patch 40 or later, or the latest available version.
3. If immediate patching is not possible, implement WAF rules to filter XSS payloads targeting Zimbra web client endpoints.
Detection & Monitoring:
4. Monitor web server logs for suspicious JavaScript injection patterns in email-related HTTP requests.
5. Deploy Content Security Policy (CSP) headers to restrict inline script execution.
6. Review email quarantine logs for messages containing suspicious HTML/JavaScript payloads.
7. Implement browser-based XSS protection headers (X-XSS-Protection, X-Content-Type-Options).
Compensating Controls:
8. Restrict Zimbra web client access to internal networks or VPN-only access.
9. Enable multi-factor authentication for all Zimbra accounts.
10. Consider disabling HTML email rendering and forcing plain-text mode until patching is complete.
11. Segment Zimbra servers from critical internal networks.
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع مثيلات Zimbra Collaboration Suite في بيئتكم وتحديد أرقام إصداراتها.
2. تطبيق أحدث تصحيحات Zimbra الأمنية فوراً — الترقية إلى ZCS 8.8.15 Patch 40 أو أحدث.
3. في حال عدم إمكانية التصحيح الفوري، تطبيق قواعد جدار حماية تطبيقات الويب (WAF) لتصفية حمولات XSS.
الكشف والمراقبة:
4. مراقبة سجلات خادم الويب بحثاً عن أنماط حقن JavaScript المشبوهة.
5. نشر رؤوس سياسة أمان المحتوى (CSP) لتقييد تنفيذ النصوص البرمجية المضمنة.
6. مراجعة سجلات حجر البريد الإلكتروني بحثاً عن رسائل تحتوي على حمولات HTML/JavaScript مشبوهة.
7. تفعيل رؤوس حماية XSS في المتصفح.
الضوابط التعويضية:
8. تقييد الوصول إلى عميل Zimbra الويب على الشبكات الداخلية أو عبر VPN فقط.
9. تفعيل المصادقة متعددة العوامل لجميع حسابات Zimbra.
10. النظر في تعطيل عرض البريد الإلكتروني بتنسيق HTML وفرض وضع النص العادي حتى اكتمال التصحيح.
11. عزل خوادم Zimbra عن الشبكات الداخلية الحرجة.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
2-3-1 (Vulnerability Management)
2-5-1 (Web Application Security)
2-2-3 (Patch Management)
2-6-1 (Email Security)
🔵 SAMA CSF
3.3.3 (Patch Management)
3.3.5 (Vulnerability Management)
3.4.1 (Secure Configuration)
3.3.7 (Web Application Security)
🟡 ISO 27001:2022
A.8.8 (Management of technical vulnerabilities)
A.8.9 (Configuration management)
A.8.23 (Web filtering)
A.8.7 (Protection against malware)
🟣 PCI DSS v4.0
6.3.3 (Patching security vulnerabilities)
6.4.1 (Public-facing web applications protection)
11.3.1 (Internal vulnerability scans)
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Synacor:Zimbra Collaboration Suite (ZCS)