📄 Description (English)
Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
🤖 AI Executive Summary
CVE-2026-4699 is a high-severity vulnerability (CVSS 7.5) affecting Mozilla Firefox and Thunderbird due to incorrect boundary conditions in text and font layout processing. This memory safety issue could enable remote code execution through specially crafted web content or emails. Immediate patching is critical as the vulnerability affects multiple Firefox ESR versions widely deployed in Saudi organizations.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 1, 2026 06:32
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi government entities (NCA, CITC), banking sector (SAMA-regulated institutions, STC), healthcare organizations, and energy sector (ARAMCO). Firefox ESR is widely deployed in corporate environments across these sectors. The vulnerability could enable attackers to compromise workstations through malicious websites or phishing emails containing crafted content, potentially leading to data exfiltration, lateral movement, and system compromise. Government and financial institutions are particularly at risk due to their reliance on Firefox for secure communications.
🏢 Affected Saudi Sectors
Government (NCA, CITC)
Banking and Financial Services (SAMA-regulated)
Telecommunications (STC, Mobily)
Healthcare
Energy (ARAMCO)
Education
Defense and Security
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Inventory all Firefox and Thunderbird installations across your organization, prioritizing ESR versions (115.x, 140.x)
2. Disable JavaScript execution in Firefox as a temporary compensating control until patches are available
3. Implement email filtering to block potentially malicious attachments and suspicious links
4. Monitor for exploitation attempts using network IDS signatures
Patching Guidance:
1. Subscribe to Mozilla security advisories for patch availability
2. Prepare deployment procedures for Firefox ESR 115.34+, 140.9+, and Firefox 149+
3. Test patches in isolated environments before enterprise rollout
4. Establish a 48-72 hour patching timeline once updates are released
Compensating Controls:
1. Deploy web content filtering to block known malicious domains
2. Implement application whitelisting to restrict Firefox execution
3. Enable Enhanced Tracking Protection and Strict mode in Firefox
4. Deploy endpoint detection and response (EDR) solutions to detect exploitation attempts
5. Restrict Firefox usage to essential business functions only
Detection Rules:
1. Monitor for Firefox/Thunderbird crashes with memory corruption indicators
2. Alert on unusual font file access or processing
3. Track Firefox process spawning child processes unexpectedly
4. Monitor for network connections from Firefox to suspicious destinations
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع تثبيتات Firefox و Thunderbird عبر مؤسستك، مع إعطاء الأولوية لإصدارات ESR (115.x، 140.x)
2. قم بتعطيل تنفيذ JavaScript في Firefox كإجراء تعويضي مؤقت حتى تتوفر التصحيحات
3. تطبيق تصفية البريد الإلكتروني لحجب المرفقات المحتملة الخطورة والروابط المريبة
4. مراقبة محاولات الاستغلال باستخدام توقيعات IDS الشبكية
إرشادات التصحيح:
1. الاشتراك في تنبيهات أمان Mozilla لتوفر التصحيحات
2. تحضير إجراءات النشر لـ Firefox ESR 115.34+، 140.9+، و Firefox 149+
3. اختبار التصحيحات في بيئات معزولة قبل النشر على مستوى المؤسسة
4. إنشاء جدول زمني للتصحيح مدته 48-72 ساعة بمجرد إصدار التحديثات
الضوابط التعويضية:
1. نشر تصفية محتوى الويب لحجب النطاقات الخطرة المعروفة
2. تطبيق القائمة البيضاء للتطبيقات لتقييد تنفيذ Firefox
3. تفعيل الحماية المحسّنة من التتبع والوضع الصارم في Firefox
4. نشر حلول الكشف والاستجابة على نقاط النهاية (EDR)
5. تقييد استخدام Firefox للوظائف التجارية الأساسية فقط
قواعد الكشف:
1. مراقبة أعطال Firefox/Thunderbird مع مؤشرات تلف الذاكرة
2. التنبيه على الوصول غير المعتاد أو معالجة ملفات الخطوط
3. تتبع عملية Firefox التي تولد عمليات فرعية بشكل غير متوقع
4. مراقبة الاتصالات الشبكية من Firefox إلى وجهات مريبة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies and Procedures
A.6.1.1 - Organization of Information Security
A.8.1.1 - Asset Management
A.12.2.1 - Change Management
A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset Inventory and Risk Assessment
PR.IP-12 - Software Development and Change Management
DE.CM-8 - Vulnerability Scanning
RS.MI-2 - Incident Response and Mitigation
🟡 ISO 27001:2022
A.12.3.1 - Segregation of development, test and production environments
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy
A.14.2.5 - Secure development environment
🟣 PCI DSS v4.0.1
6.2 - Ensure all system components and software are protected from known vulnerabilities
6.3 - Develop and maintain secure applications
🔗 References & Sources 6
🔗
🔗
https://bugzilla.mozilla.org/show_bug.cgi?id=2021863
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