📄 Description (English)
Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
🤖 AI Executive Summary
A sandbox escape vulnerability (CVE-2026-4687) exists in Mozilla Firefox and Thunderbird's Telemetry component due to incorrect boundary conditions, affecting versions before Firefox 149, Firefox ESR 115.34/140.9, and Thunderbird 149/140.9. With a CVSS score of 8.6, this vulnerability could allow attackers to escape the browser sandbox and execute arbitrary code with elevated privileges. No patch is currently available, requiring immediate compensating controls and user awareness in Saudi organizations.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 24, 2026 00:30
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi government entities (NCA, NCSC), banking sector (SAMA-regulated institutions, major banks), and telecommunications companies (STC, Mobily) where Firefox/Thunderbird are used for secure communications and email. Healthcare organizations using these browsers for patient data access and energy sector (ARAMCO) personnel using Firefox for critical operations are also at risk. The sandbox escape capability could lead to unauthorized access to sensitive government communications, financial data, and critical infrastructure information.
🏢 Affected Saudi Sectors
Government (NCA, NCSC, Ministry of Interior)
Banking and Financial Services (SAMA-regulated institutions)
Telecommunications (STC, Mobily, Zain)
Healthcare (Ministry of Health, private hospitals)
Energy (ARAMCO, SEC)
Education (Universities, research institutions)
Defense and Security
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all Firefox and Thunderbird installations across the organization, prioritizing government and financial systems
2. Disable Telemetry features in Firefox/Thunderbird via about:config (set datareporting.policy.dataSubmissionPolicyAcceptedVersion to 0)
3. Restrict Firefox/Thunderbird usage to isolated networks or virtual machines for high-risk users
4. Implement application whitelisting to prevent unauthorized browser execution
COMPENSATING CONTROLS:
5. Deploy network segmentation to limit lateral movement if sandbox escape occurs
6. Enable Enhanced Tracking Protection and disable JavaScript execution for untrusted sites
7. Implement endpoint detection and response (EDR) solutions with behavioral monitoring
8. Monitor for suspicious process creation and privilege escalation attempts
PATCHING GUIDANCE:
9. Subscribe to Mozilla security advisories and apply patches immediately upon release
10. Test patches in non-production environments before deployment
11. Establish expedited patching procedures for critical vulnerabilities
DETECTION RULES:
12. Monitor for firefox.exe/thunderbird.exe spawning child processes with elevated privileges
13. Alert on unexpected network connections from browser processes
14. Track modifications to browser configuration files and registry entries
15. Implement YARA rules to detect known sandbox escape exploitation patterns
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع تثبيتات Firefox و Thunderbird عبر المنظمة، مع إعطاء الأولوية للأنظمة الحكومية والمالية
2. تعطيل ميزات القياس الحراري في Firefox/Thunderbird عبر about:config (تعيين datareporting.policy.dataSubmissionPolicyAcceptedVersion إلى 0)
3. تقييد استخدام Firefox/Thunderbird على الشبكات المعزولة أو الآلات الافتراضية للمستخدمين عالي المخاطر
4. تطبيق قائمة التطبيقات المسموحة لمنع تنفيذ المتصفح غير المصرح به
الضوابط التعويضية:
5. نشر تقسيم الشبكة لتحديد الحركة الجانبية في حالة الهروب من الحماية
6. تفعيل حماية التتبع المحسنة وتعطيل تنفيذ JavaScript للمواقع غير الموثوقة
7. تطبيق حلول الكشف والاستجابة على نقطة النهاية (EDR) مع المراقبة السلوكية
8. مراقبة محاولات إنشاء العمليات المريبة وتصعيد الامتيازات
إرشادات التصحيح:
9. الاشتراك في تنبيهات أمان Mozilla وتطبيق التصحيحات فوراً عند الإصدار
10. اختبار التصحيحات في بيئات غير الإنتاج قبل النشر
11. إنشاء إجراءات تصحيح معجلة للثغرات الحرجة
قواعد الكشف:
12. مراقبة firefox.exe/thunderbird.exe لإنشاء عمليات فرعية بامتيازات مرتفعة
13. تنبيه الاتصالات الشبكية غير المتوقعة من عمليات المتصفح
14. تتبع التعديلات على ملفات إعدادات المتصفح وإدخالات السجل
15. تطبيق قواعس YARA للكشف عن أنماط استغلال الهروب من الحماية المعروفة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Information Security Policies and Procedures
ECC 2024 A.6.1.1 - Organization of Information Security
ECC 2024 A.8.1.1 - Asset Management
ECC 2024 A.12.2.1 - Change Management
ECC 2024 A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Business Environment
SAMA CSF PR.IP-1 - Information Protection Processes
SAMA CSF PR.IP-12 - Software, Firmware, and Information Integrity
SAMA CSF DE.CM-8 - Vulnerability Scans
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for Information Security
ISO 27001:2022 A.8.1 - Asset Management
ISO 27001:2022 A.12.6 - Management of Technical Vulnerabilities and Exposures
ISO 27001:2022 A.14.2 - Development Security
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security Patches and Updates
PCI DSS 11.2 - Vulnerability Scanning
🔗 References & Sources 6
🔗
🔗
https://bugzilla.mozilla.org/show_bug.cgi?id=2016368
security@mozilla.org
Permissions Required
🔗
https://www.mozilla.org/security/advisories/mfsa2026-20/
security@mozilla.org
Vendor Advisory
🔗
https://www.mozilla.org/security/advisories/mfsa2026-21/
security@mozilla.org
Vendor Advisory
🔗
https://www.mozilla.org/security/advisories/mfsa2026-22/
security@mozilla.org
Vendor Advisory
🔗
https://www.mozilla.org/security/advisories/mfsa2026-23/
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-24/
security@mozilla.org
📦 Affected Products / CPE 3 entries
mozilla:firefox
mozilla:firefox
mozilla:firefox