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Vulnerabilities

CVE-2026-40382

High
CWE-416 — Weakness Type
Published: May 12, 2026  ·  Modified: May 19, 2026  ·  Source: NVD
CVSS v3
7.8
🔗 NVD Official
📄 Description (English)

Use after free in Windows Telephony Service allows an authorized attacker to elevate privileges locally.

🤖 AI Executive Summary

CVE-2026-40382 is a use-after-free vulnerability in Windows Telephony Service affecting multiple Windows 10 versions, allowing authorized local attackers to escalate privileges. With a CVSS score of 7.8 and no patch currently available, this poses a significant risk to Saudi organizations relying on Windows 10 infrastructure. The vulnerability requires local access but enables privilege escalation, making it critical for organizations with strict access controls.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 19, 2026 00:17
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi government agencies (NCA, NCSC), banking sector (SAMA-regulated institutions, major banks), healthcare organizations, and telecommunications providers (STC, Mobily) that operate Windows 10 infrastructure. Government entities and financial institutions are particularly vulnerable due to widespread Windows 10 deployment. The privilege escalation capability could enable attackers to compromise sensitive systems handling national security data, financial transactions, and critical infrastructure operations. Organizations in the energy sector (ARAMCO) and defense contractors are also at elevated risk.
🏢 Affected Saudi Sectors
Government and Public Administration Banking and Financial Services Healthcare and Medical Services Telecommunications Energy and Utilities Defense and Security Education
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Inventory all Windows 10 systems (versions 1607, 1809, 21H2, 22H2) across your organization
2. Restrict local access to Windows Telephony Service (tapisrv.exe) through Group Policy and access controls
3. Disable Windows Telephony Service if not required for business operations
4. Implement application whitelisting to prevent unauthorized execution

Compensating Controls:
1. Apply principle of least privilege - ensure users operate with standard accounts, not administrator
2. Enable Windows Defender Application Guard for high-risk systems
3. Deploy endpoint detection and response (EDR) solutions to monitor for suspicious process behavior
4. Monitor Event Viewer for tapisrv.exe crashes and abnormal termination events
5. Implement strict local access controls and multi-factor authentication for privileged accounts

Detection Rules:
1. Monitor for tapisrv.exe process crashes or unexpected terminations
2. Alert on privilege escalation attempts following tapisrv.exe execution
3. Track unauthorized modifications to telephony service registry keys
4. Monitor for suspicious child processes spawned from tapisrv.exe context

Patching:
1. Monitor Microsoft Security Updates regularly for patch availability
2. Prepare patch deployment procedures for immediate application once available
3. Maintain updated Windows 10 versions (prioritize 22H2 which receives longer support)
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع أنظمة Windows 10 (الإصدارات 1607، 1809، 21H2، 22H2) عبر مؤسستك
2. قيد الوصول المحلي إلى خدمة Windows Telephony (tapisrv.exe) من خلال Group Policy وضوابط الوصول
3. عطل خدمة Windows Telephony إذا لم تكن مطلوبة للعمليات التجارية
4. طبق القائمة البيضاء للتطبيقات لمنع التنفيذ غير المصرح

الضوابط البديلة:
1. طبق مبدأ أقل امتياز - تأكد من أن المستخدمين يعملون بحسابات قياسية وليس مسؤول
2. فعل Windows Defender Application Guard للأنظمة عالية المخاطر
3. نشر حلول كشف الاستجابة للنقاط الطرفية (EDR) لمراقبة السلوك المريب
4. راقب Event Viewer لأعطال tapisrv.exe والإنهاء غير الطبيعي
5. طبق ضوابط وصول محلية صارمة والمصادقة متعددة العوامل للحسابات المميزة

قواعد الكشف:
1. راقب أعطال عملية tapisrv.exe أو الإنهاء غير المتوقع
2. أصدر تنبيهات لمحاولات تصعيد الامتيازات بعد تنفيذ tapisrv.exe
3. تتبع التعديلات غير المصرح بها على مفاتيح سجل خدمة الهاتفية
4. راقب العمليات الفرعية المريبة المنبثقة من سياق tapisrv.exe

التصحيح:
1. راقب تحديثات أمان Microsoft بانتظام لتوفر التصحيحات
2. جهز إجراءات نشر التصحيحات للتطبيق الفوري عند توفرها
3. حافظ على إصدارات Windows 10 المحدثة (أولويات 22H2 التي تتلقى دعمًا أطول)
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control Policy ECC 2024 A.5.2.1 - User Registration and De-registration ECC 2024 A.5.3.1 - Privileged Access Rights ECC 2024 A.6.2.1 - Malware Protection ECC 2024 A.8.2.3 - Logging and Monitoring
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Software Inventory SAMA CSF PR.AC-1 - Access Control Policy SAMA CSF PR.AC-4 - Access Rights Management SAMA CSF DE.CM-1 - System Monitoring SAMA CSF DE.CM-3 - Event Detection
🟡 ISO 27001:2022
ISO 27001:2022 A.5.3 - Segregation of Duties ISO 27001:2022 A.8.2 - Privileged Access Rights ISO 27001:2022 A.8.3 - Information Access Restriction ISO 27001:2022 A.8.4 - Access to Cryptography ISO 27001:2022 A.12.4 - Logging
🟣 PCI DSS v4.0.1
PCI DSS 2.1 - Default Passwords PCI DSS 6.2 - Security Patches PCI DSS 7.1 - Limit Access to System Components PCI DSS 10.2 - Implement Automated Audit Trails
📦 Affected Products / CPE 25 entries
microsoft:windows_10_1607
microsoft:windows_10_1607
microsoft:windows_10_1809
microsoft:windows_10_1809
microsoft:windows_10_21h2
microsoft:windows_10_21h2
microsoft:windows_10_21h2
microsoft:windows_10_22h2
microsoft:windows_10_22h2
microsoft:windows_10_22h2
microsoft:windows_11_23h2
microsoft:windows_11_23h2
microsoft:windows_11_24h2
microsoft:windows_11_24h2
microsoft:windows_11_25h2
microsoft:windows_11_25h2
microsoft:windows_11_26h1
microsoft:windows_11_26h1
microsoft:windows_server_2012:-
microsoft:windows_server_2012:r2
microsoft:windows_server_2016
microsoft:windows_server_2019
microsoft:windows_server_2022
microsoft:windows_server_2022_23h2
microsoft:windows_server_2025
📊 CVSS Score
7.8
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorL — Low / Local
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.8
CWECWE-416
EPSS0.05%
Exploit No
Patch ✗ No
Published 2026-05-12
Source Feed nvd
Views 1
🇸🇦 Saudi Risk Score
7.8
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-416
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