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Vulnerabilities

CVE-2026-40364

High
CWE-122 — Weakness Type
Published: May 12, 2026  ·  Modified: May 19, 2026  ·  Source: NVD
CVSS v3
8.4
🔗 NVD Official
📄 Description (English)

Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.

🤖 AI Executive Summary

CVE-2026-40364 is a type confusion vulnerability in Microsoft Office Word with a CVSS score of 8.4 that enables local code execution. This high-severity flaw affects Word's resource access mechanisms and poses significant risk to organizations relying on Office for document processing. Currently, no patch is available and no public exploits exist, but the vulnerability requires immediate monitoring and mitigation planning.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 18, 2026 19:27
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses critical risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), and large enterprises using Microsoft Office. Saudi organizations in financial services, healthcare (MOH), energy sector (ARAMCO), and telecommunications (STC) are particularly vulnerable. The type confusion flaw could enable attackers to escalate privileges and execute arbitrary code on systems processing sensitive documents, affecting data confidentiality and system integrity across critical infrastructure.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare Energy and Utilities Telecommunications Education Large Enterprises
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Inventory all Microsoft Office Word installations across your organization
2. Restrict Word document opening to trusted sources only
3. Disable macros in Word documents until patch availability
4. Implement application whitelisting for Office processes

Compensating Controls:
1. Deploy endpoint detection and response (EDR) solutions to monitor Word process behavior
2. Isolate systems processing untrusted documents in sandboxed environments
3. Implement file integrity monitoring on Office installation directories
4. Enable Windows Defender Application Guard for Office document handling
5. Restrict local administrator privileges to reduce code execution impact

Detection Rules:
1. Monitor for abnormal Word.exe child process creation (cmd.exe, powershell.exe, rundll32.exe)
2. Alert on unexpected memory access patterns in Word processes
3. Track suspicious registry modifications initiated by Word
4. Monitor for unusual network connections from Word processes
5. Log all document access and modification events

Patching Strategy:
1. Subscribe to Microsoft Security Update Guide for CVE-2026-40364 patch release
2. Establish expedited patching timeline once patch becomes available
3. Test patches in isolated environment before enterprise deployment
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع تثبيتات Microsoft Office Word عبر المنظمة
2. تقييد فتح مستندات Word للمصادر الموثوقة فقط
3. تعطيل وحدات الماكروس في مستندات Word حتى توفر التصحيح
4. تطبيق القائمة البيضاء للتطبيقات لعمليات Office

الضوابط البديلة:
1. نشر حلول الكشف والاستجابة على نقاط النهاية لمراقبة سلوك عمليات Word
2. عزل الأنظمة التي تعالج المستندات غير الموثوقة في بيئات معزولة
3. تطبيق مراقبة سلامة الملفات على دلائل تثبيت Office
4. تفعيل Windows Defender Application Guard لمعالجة مستندات Office
5. تقييد امتيازات المسؤول المحلي لتقليل تأثير تنفيذ الأكواد

قواعد الكشف:
1. مراقبة إنشاء عمليات فرعية غير عادية من Word.exe
2. التنبيه على أنماط الوصول للذاكرة المريبة في عمليات Word
3. تتبع تعديلات السجل المريبة التي يبدأها Word
4. مراقبة الاتصالات الشبكية غير العادية من عمليات Word
5. تسجيل جميع أحداث الوصول وتعديل المستندات

استراتيجية التصحيح:
1. الاشتراك في دليل تحديثات أمان Microsoft للحصول على إصدار التصحيح
2. إنشاء جدول زمني معجل للتصحيح بمجرد توفره
3. اختبار التصحيحات في بيئة معزولة قبل النشر على المستوى الإداري
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Information Security Policies ECC 2024 A.5.2.1 - Access Control ECC 2024 A.6.1.1 - Cryptography and Data Protection ECC 2024 A.8.1.1 - Malware Protection ECC 2024 A.12.2.1 - Change Management
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Software Inventory SAMA CSF PR.AC-1 - Access Control SAMA CSF PR.PT-1 - Security Testing SAMA CSF DE.CM-1 - Anomalies Detection SAMA CSF RS.MI-1 - Incident Response
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for Information Security ISO 27001:2022 A.8.1 - User Endpoint Devices ISO 27001:2022 A.8.2 - Privileged Access Rights ISO 27001:2022 A.8.3 - Information Access Restriction ISO 27001:2022 A.12.6 - Change Management
🟣 PCI DSS v4.0.1
PCI DSS 2.4 - Configuration Standards PCI DSS 6.2 - Security Patches PCI DSS 10.2 - User Activity Logging
📊 CVSS Score
8.4
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorL — Low / Local
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score8.4
CWECWE-122
EPSS0.19%
Exploit No
Patch ✗ No
Published 2026-05-12
Source Feed nvd
🇸🇦 Saudi Risk Score
8.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-122
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