📄 Description (English)
Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability — Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability in the Calendar feature that allows an attacker to execute arbitrary code.
🤖 AI Executive Summary
CVE-2022-24682 is a critical cross-site scripting (XSS) vulnerability in Synacor Zimbra Collaboration Suite affecting the Calendar feature with a CVSS score of 9.0. An attacker can execute arbitrary JavaScript code in the context of authenticated users' browsers, potentially leading to session hijacking, credential theft, and unauthorized access to sensitive email and calendar data. With public exploits available, this vulnerability poses an immediate threat to organizations using ZCS and requires urgent patching.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 21, 2026 17:36
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations heavily reliant on Zimbra for email and collaboration. Primary impact sectors include: (1) Banking and Financial Services — SAMA-regulated institutions using ZCS for internal communications and customer data management face risks of unauthorized access and data exfiltration; (2) Government Agencies — NCA and other federal entities using Zimbra for classified communications are at high risk; (3) Healthcare Providers — SFDA-regulated hospitals and clinics using ZCS for patient communications; (4) Energy Sector — ARAMCO and affiliated companies using Zimbra for operational communications; (5) Telecommunications — STC and other telecom operators using ZCS for internal collaboration. The XSS vulnerability enables attackers to steal session tokens, impersonate users, and access sensitive business communications.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Healthcare
Energy and Utilities
Telecommunications
Education
Large Enterprises
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Zimbra Collaboration Suite instances in your environment and document versions
2. Restrict access to the Calendar feature via firewall/WAF rules if immediate patching is not possible
3. Monitor for suspicious calendar-related activities and XSS payloads in logs
4. Alert users to avoid clicking suspicious calendar links or invitations
PATCHING GUIDANCE:
1. Apply Synacor's security patches immediately — patches are available for affected ZCS versions
2. Test patches in a non-production environment first
3. Implement a phased rollout to minimize business disruption
4. Verify patch application by checking version numbers and running Zimbra diagnostic tools
COMPENSATING CONTROLS (if patching is delayed):
1. Deploy Web Application Firewall (WAF) rules to detect and block XSS payloads in Calendar requests
2. Implement Content Security Policy (CSP) headers to restrict script execution
3. Enable browser-based XSS protection and disable JavaScript in email clients where possible
4. Implement strict input validation and output encoding at the application level
DETECTION RULES:
1. Monitor for Calendar API requests containing script tags, event handlers (onclick, onload), or encoded payloads
2. Alert on unusual calendar sharing activities or bulk calendar modifications
3. Track failed authentication attempts following calendar access
4. Monitor for session token exfiltration patterns in HTTP headers and cookies
5. Implement SIEM rules to detect XSS patterns: <script>, javascript:, onerror=, onload=, eval()
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حدد جميع مثيلات Zimbra Collaboration Suite في بيئتك وقم بتوثيق الإصدارات
2. قيد الوصول إلى ميزة التقويم عبر قواعد جدار الحماية/WAF إذا لم يكن التصحيح الفوري ممكناً
3. راقب الأنشطة المريبة المتعلقة بالتقويم وحمولات XSS في السجلات
4. حذر المستخدمين من تجنب النقر على روابط التقويم المريبة أو الدعوات
إرشادات التصحيح:
1. طبق تصحيحات الأمان من Synacor على الفور — التصحيحات متاحة لإصدارات ZCS المتأثرة
2. اختبر التصحيحات في بيئة غير إنتاجية أولاً
3. نفذ طرح مرحلي لتقليل انقطاع الأعمال
4. تحقق من تطبيق التصحيح بفحص أرقام الإصدارات وتشغيل أدوات تشخيص Zimbra
الضوابط البديلة (إذا تأخر التصحيح):
1. نشر قواعد جدار تطبيقات الويب (WAF) للكشف عن حمولات XSS وحجبها في طلبات التقويم
2. تنفيذ رؤوس سياسة أمان المحتوى (CSP) لتقييد تنفيذ البرامج النصية
3. تفعيل حماية XSS المستندة إلى المتصفح وتعطيل JavaScript في عملاء البريد حيث أمكن
4. تنفيذ التحقق الصارم من المدخلات والترميز الناتج على مستوى التطبيق
قواعد الكشف:
1. راقب طلبات Calendar API التي تحتوي على علامات البرامج النصية أو معالجات الأحداث أو الحمولات المشفرة
2. تنبيه على أنشطة مشاركة التقويم غير العادية أو تعديلات التقويم الجماعية
3. تتبع محاولات المصادقة الفاشلة بعد الوصول إلى التقويم
4. راقب أنماط سرقة رموز الجلسة في رؤوس HTTP والملفات
5. تنفيذ قواعد SIEM للكشف عن أنماط XSS
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.14.2.1 — Information security requirements for system development and maintenance
ECC 2024 A.14.2.5 — Secure development policy and procedures
ECC 2024 A.12.6.1 — Management of technical vulnerabilities
ECC 2024 A.12.2.1 — Monitoring of system use
🔵 SAMA CSF
SAMA CSF ID.BE-3 — Resilience objectives and priorities
SAMA CSF PR.DS-6 — Data is protected from unauthorized access
SAMA CSF DE.CM-1 — The network is monitored to detect potential cybersecurity events
SAMA CSF RS.MI-1 — Incidents are contained
🟡 ISO 27001:2022
ISO 27001:2022 A.5.23 — Information security for supplier relationships
ISO 27001:2022 A.8.1 — User endpoint devices
ISO 27001:2022 A.12.6.1 — Management of technical vulnerabilities
ISO 27001:2022 A.14.2.1 — Secure development policy
🟣 PCI DSS v4.0
PCI DSS 6.2 — Ensure that all system components and software are protected from known vulnerabilities
PCI DSS 6.5.7 — Cross-site scripting (XSS)
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Synacor:Zimbra Collaborate Suite (ZCS)