📄 Description (English)
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
🤖 AI Executive Summary
CVE-2026-26114 is a critical deserialization vulnerability in Microsoft SharePoint Server 2016 and 2019 that allows authenticated attackers to execute arbitrary code remotely with a CVSS score of 8.8. This vulnerability poses significant risk to Saudi organizations heavily reliant on SharePoint for document management and collaboration. Immediate patching is essential as the attack requires only valid credentials, which are common in enterprise environments.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 22, 2026 20:52
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi government entities, ARAMCO, banking sector institutions under SAMA oversight, and large enterprises using SharePoint for critical document management. Government agencies managing sensitive policy documents, financial institutions storing customer data, and energy sector organizations are at highest risk. The vulnerability affects both on-premises and hybrid SharePoint deployments common in Saudi organizations. Potential impact includes unauthorized access to classified government documents, financial data theft, and operational disruption of critical infrastructure.
🏢 Affected Saudi Sectors
Government and Public Administration
Banking and Financial Services
Energy and Utilities (ARAMCO)
Telecommunications (STC, Mobily)
Healthcare
Education
Large Enterprises
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all SharePoint Server 2016 and 2019 instances in your environment using asset discovery tools
2. Restrict SharePoint access to trusted networks only using firewall rules and network segmentation
3. Implement multi-factor authentication (MFA) for all SharePoint user accounts to reduce credential compromise risk
4. Monitor SharePoint logs for suspicious deserialization activities and unusual code execution patterns
PATCHING GUIDANCE:
1. Apply Microsoft security updates immediately upon availability for SharePoint Server 2016 and 2019
2. Test patches in non-production environments first to ensure compatibility
3. Prioritize patching for internet-facing SharePoint instances
4. Schedule patching during maintenance windows with minimal business impact
COMPENSATING CONTROLS (if patching delayed):
1. Disable remote code execution features in SharePoint if not required for operations
2. Implement Web Application Firewall (WAF) rules to detect and block deserialization payloads
3. Use network-based intrusion detection/prevention systems (IDS/IPS) to monitor for exploitation attempts
4. Enforce principle of least privilege for SharePoint service accounts
DETECTION RULES:
1. Monitor for unusual .NET deserialization activities in SharePoint application logs
2. Alert on unexpected process creation from SharePoint worker processes (w3wp.exe)
3. Track failed and successful authentication attempts to SharePoint
4. Monitor for suspicious PowerShell execution originating from SharePoint services
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع مثيلات خادم SharePoint 2016 و2019 في بيئتك باستخدام أدوات اكتشاف الأصول
2. تقييد الوصول إلى SharePoint للشبكات الموثوقة فقط باستخدام قواعد جدار الحماية والفصل الشبكي
3. تنفيذ المصادقة متعددة العوامل (MFA) لجميع حسابات مستخدمي SharePoint لتقليل خطر اختراق بيانات الاعتماد
4. مراقبة سجلات SharePoint للأنشطة المريبة المتعلقة بفك التسلسل وأنماط تنفيذ الكود غير العادية
إرشادات التصحيح:
1. تطبيق تحديثات أمان Microsoft فوراً عند توفرها لخادم SharePoint 2016 و2019
2. اختبار التصحيحات في بيئات غير الإنتاج أولاً لضمان التوافقية
3. إعطاء الأولوية لتصحيح مثيلات SharePoint المواجهة للإنترنت
4. جدولة التصحيحات خلال نوافذ الصيانة بأقل تأثير على العمليات
الضوابط البديلة (إذا تأخر التصحيح):
1. تعطيل ميزات تنفيذ الكود البعيد في SharePoint إذا لم تكن مطلوبة للعمليات
2. تنفيذ قواعد جدار تطبيقات الويب (WAF) للكشف عن حمولات فك التسلسل وحجبها
3. استخدام أنظمة الكشف/الوقاية من الاختراق القائمة على الشبكة (IDS/IPS) لمراقبة محاولات الاستغلال
4. فرض مبدأ أقل امتياز لحسابات خدمة SharePoint
قواعد الكشف:
1. مراقبة أنشطة فك التسلسل غير العادية في سجلات تطبيق SharePoint
2. التنبيه على إنشاء عمليات غير متوقعة من عمليات عامل SharePoint (w3wp.exe)
3. تتبع محاولات المصادقة الفاشلة والناجحة لـ SharePoint
4. مراقبة تنفيذ PowerShell المريب الناشئ من خدمات SharePoint
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.8.1.1 - User access management and authentication
A.12.2.1 - Change management procedures
A.12.6.1 - Management of technical vulnerabilities
🔵 SAMA CSF
ID.AM-2 - Software inventory and asset management
PR.AC-1 - Access control and authentication mechanisms
PR.PT-2 - Protective technology deployment
DE.CM-8 - Vulnerability scanning and management
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Change management procedures
A.5.1.1 - Information security policies
A.8.1.4 - Access rights review and management
🟣 PCI DSS v4.0
6.2 - Security patches and updates
6.5.1 - Injection flaws prevention
11.2 - Vulnerability scanning
📦 Affected Products / CPE 2 entries
microsoft:sharepoint_server:2016
microsoft:sharepoint_server:2019