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Vulnerabilities

CVE-2026-26131

High
Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
CWE-276 — Weakness Type
Published: Mar 10, 2026  ·  Modified: Mar 17, 2026  ·  Source: NVD
CVSS v3
7.8
🔗 NVD Official
📄 Description (English)

Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.

🤖 AI Executive Summary

CVE-2026-26131 is a privilege escalation vulnerability in .NET with a CVSS score of 7.8 affecting default file permissions (CWE-276). An authorized local attacker can exploit incorrect default permissions to elevate privileges on affected systems. While no public exploit is currently available, a patch has been released and immediate deployment is recommended for organizations running .NET applications.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 29, 2026 09:06
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations using .NET applications across multiple sectors: Banking and financial institutions (SAMA-regulated) relying on .NET for core systems, Government agencies (NCA oversight) running .NET-based applications, Healthcare providers using .NET for patient management systems, Telecommunications operators (STC, Mobily) with .NET infrastructure, and Energy sector organizations. The privilege escalation capability could allow insider threats or compromised user accounts to gain system-level access, potentially leading to data exfiltration, system compromise, or lateral movement within critical infrastructure.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare and Medical Services Energy and Utilities Telecommunications Manufacturing Retail and E-commerce
⚖️ Saudi Risk Score (AI)
7.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all systems running .NET framework/runtime versions affected by CVE-2026-26131
2. Audit current file and directory permissions on .NET application directories
3. Restrict local access to .NET application directories to authorized users only

Patching Guidance:
1. Apply the official Microsoft .NET security patch immediately to all affected systems
2. Prioritize patching for systems in critical infrastructure (banking, government, healthcare, energy)
3. Test patches in non-production environments before deployment
4. Implement a phased rollout plan with monitoring for application compatibility

Compensating Controls (if immediate patching not possible):
1. Implement strict file permission controls: Remove unnecessary write permissions from .NET application directories
2. Apply principle of least privilege to user accounts accessing .NET applications
3. Monitor and audit local privilege escalation attempts using Windows Event Logs (Event ID 4688, 4672)
4. Implement application whitelisting to prevent unauthorized privilege escalation tools
5. Use AppLocker or Windows Defender Application Control to restrict execution

Detection Rules:
1. Monitor for unexpected privilege elevation events in .NET application processes
2. Alert on modifications to .NET application directory permissions
3. Track failed and successful privilege escalation attempts via Windows Security Event Log
4. Monitor for suspicious file access patterns in .NET directories by low-privileged accounts
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تشغل إصدارات .NET Framework/Runtime المتأثرة بـ CVE-2026-26131
2. تدقيق أذونات الملفات والمجلدات الحالية في مجلدات تطبيقات .NET
3. تقييد الوصول المحلي إلى مجلدات تطبيقات .NET للمستخدمين المصرح لهم فقط

إرشادات التصحيح:
1. تطبيق تصحيح أمان .NET الرسمي من Microsoft فوراً على جميع الأنظمة المتأثرة
2. إعطاء الأولوية لتصحيح الأنظمة في البنية التحتية الحرجة (البنوك والحكومة والرعاية الصحية والطاقة)
3. اختبار التصحيحات في بيئات غير الإنتاج قبل النشر
4. تنفيذ خطة نشر مرحلية مع المراقبة لتوافق التطبيقات

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تنفيذ ضوابط أذونات الملفات الصارمة: إزالة أذونات الكتابة غير الضرورية من مجلدات تطبيقات .NET
2. تطبيق مبدأ أقل امتياز على حسابات المستخدمين التي تصل إلى تطبيقات .NET
3. مراقبة وتدقيق محاولات رفع الامتيازات المحلية باستخدام سجلات أحداث Windows
4. تنفيذ قائمة بيضاء للتطبيقات لمنع أدوات رفع الامتيازات غير المصرح بها
5. استخدام AppLocker أو Windows Defender Application Control لتقييد التنفيذ

قواعد الكشف:
1. مراقبة أحداث رفع الامتيازات غير المتوقعة في عمليات تطبيقات .NET
2. التنبيه على تعديلات أذونات مجلدات تطبيقات .NET
3. تتبع محاولات رفع الامتيازات الفاشلة والناجحة عبر سجل أحداث أمان Windows
4. مراقبة أنماط الوصول إلى الملفات المريبة في مجلدات .NET من قبل الحسابات منخفضة الامتيازات
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control Policies ECC 2024 A.5.2.1 - User Registration and De-registration ECC 2024 A.5.3.1 - Access Rights Review ECC 2024 A.9.2.1 - User Access Management ECC 2024 A.9.4.3 - Password Management
🔵 SAMA CSF
SAMA CSF ID.AM-1 - Asset Management SAMA CSF PR.AC-1 - Access Control Policy SAMA CSF PR.AC-3 - Access Enforcement SAMA CSF DE.CM-1 - System Monitoring
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Access Control ISO 27001:2022 A.5.16 - Identification and Authentication ISO 27001:2022 A.5.18 - Management of Privileged Access Rights ISO 27001:2022 A.8.3 - Cryptography ISO 27001:2022 A.8.22 - Monitoring
🟣 PCI DSS v4.0.1
PCI DSS 2.1 - Default Security Parameters PCI DSS 7.1 - Limit Access to System Components PCI DSS 8.1 - User Identification and Authentication
📊 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-276
Exploit No
Patch ✓ Yes
Published 2026-03-10
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
7.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-276
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