📄 Description (English)
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
🤖 AI Executive Summary
CVE-2026-4690 is a critical sandbox escape vulnerability in Mozilla Firefox and Thunderbird caused by integer overflow in the XPCOM component, 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 allows attackers to bypass sandbox protections and potentially execute arbitrary code with elevated privileges. No patch is currently available, making immediate mitigation through alternative controls essential for Saudi organizations.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 24, 2026 00:29
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi government entities (NCA, GOSI), banking sector (SAMA-regulated institutions, major banks), telecommunications (STC, Mobily), and energy sector (Saudi Aramco). Government employees and financial institutions using Firefox for secure communications are particularly vulnerable. The sandbox escape capability enables attackers to compromise systems handling sensitive national security and financial data. Healthcare organizations (MOH) and critical infrastructure operators are also at elevated risk due to widespread Firefox deployment.
🏢 Affected Saudi Sectors
Government (NCA, GOSI, Ministry of Interior)
Banking and Financial Services (SAMA-regulated)
Telecommunications (STC, Mobily, Zain)
Energy (Saudi Aramco, SEC)
Healthcare (MOH, private hospitals)
Critical Infrastructure
Defense and Security
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.8
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all Firefox and Thunderbird installations across your organization, prioritizing government, banking, and critical infrastructure systems
2. Disable Firefox and Thunderbird usage for sensitive operations until patches are available
3. Implement application whitelisting to restrict Firefox execution to approved users only
4. Deploy network segmentation to isolate systems running vulnerable Firefox versions from critical assets
COMPENSATING CONTROLS:
5. Enable Enhanced Tracking Protection and disable JavaScript execution in Firefox for untrusted content
6. Implement browser isolation technology (containerization) for high-risk users
7. Deploy endpoint detection and response (EDR) solutions with behavioral monitoring for XPCOM exploitation patterns
8. Restrict Firefox access to internal networks only; block external internet access
9. Monitor for exploitation attempts using YARA rules targeting integer overflow patterns in XPCOM memory operations
DETECTION RULES:
- Monitor for unusual Firefox process spawning with elevated privileges
- Alert on XPCOM component loading from non-standard locations
- Track Firefox crashes followed by suspicious child process creation
- Monitor for memory access violations in firefox.exe with subsequent code execution
PATCHING STRATEGY:
10. Subscribe to Mozilla security advisories for patch availability
11. Plan immediate deployment of Firefox 149+ and Thunderbird 149+ upon release
12. For ESR users, upgrade to Firefox ESR 115.34 or 140.9 minimum when available
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع تثبيتات Firefox و Thunderbird عبر مؤسستك، مع إعطاء الأولوية لأنظمة الحكومة والبنوك والبنية التحتية الحرجة
2. عطّل استخدام Firefox و Thunderbird للعمليات الحساسة حتى توفر التصحيحات
3. طبّق قائمة التطبيقات المسموحة لتقييد تنفيذ Firefox للمستخدمين المعتمدين فقط
4. نشّر تقسيم الشبكة لعزل الأنظمة التي تعمل بإصدارات Firefox الضعيفة عن الأصول الحرجة
الضوابط البديلة:
5. فعّل حماية التتبع المحسّنة وعطّل تنفيذ JavaScript في Firefox للمحتوى غير الموثوق
6. طبّق تكنولوجيا عزل المتصفح (الحاويات) للمستخدمين عالي المخاطر
7. نشّر حلول الكشف والاستجابة على نقاط النهاية (EDR) مع المراقبة السلوكية لأنماط استغلال XPCOM
8. قيّد وصول Firefox للشبكات الداخلية فقط؛ احجب الوصول للإنترنت الخارجي
9. راقب محاولات الاستغلال باستخدام قواعد YARA التي تستهدف أنماط تجاوز الأعداد الصحيحة في عمليات ذاكرة XPCOM
قواعد الكشف:
- راقب توليد عمليات Firefox غير العادية بامتيازات مرتفعة
- أصدر تنبيهات عند تحميل مكون XPCOM من مواقع غير قياسية
- تتبع أعطال Firefox متبوعة بإنشاء عملية فرعية مريبة
- راقب انتهاكات الوصول للذاكرة في firefox.exe متبوعة بتنفيذ أكواد
استراتيجية التصحيح:
10. اشترك في تنبيهات أمان Mozilla لتوفر التصحيحات
11. خطّط للنشر الفوري لـ Firefox 149+ و Thunderbird 149+ عند الإصدار
12. لمستخدمي ESR، قم بالترقية إلى Firefox ESR 115.34 أو 140.9 كحد أدنى عند توفره
📋 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.RA-1 - Asset management and vulnerability identification
PR.DS-6 - Integrity checking mechanisms
DE.CM-8 - Vulnerability scans
RS.MI-2 - Incident response and recovery
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy
A.12.2.1 - Change management
A.5.1.1 - Information security policies
🟣 PCI DSS v4.0.1
6.2 - Security patches and updates
6.5.1 - Injection flaws
11.2 - Vulnerability scanning
🔗 References & Sources 6
🔗
🔗
https://bugzilla.mozilla.org/show_bug.cgi?id=2016375
security@mozilla.org
Vendor Advisory
🔗
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