📄 Description (English)
Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
🤖 AI Executive Summary
CVE-2026-4707 is a high-severity vulnerability in Mozilla Firefox and Thunderbird's Canvas2D graphics component caused by incorrect boundary conditions (CWE-754). This flaw could allow attackers to cause memory corruption or information disclosure through specially crafted canvas operations. With a CVSS score of 7.5 and no patch currently available, immediate mitigation measures are critical for Saudi organizations relying on these applications.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 1, 2026 03:16
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi government entities, financial institutions, and enterprises using Firefox/Thunderbird for secure communications. Government agencies under NCA oversight, SAMA-regulated banks, and healthcare organizations (MOH) are particularly vulnerable if using these browsers for sensitive operations. The vulnerability could enable attackers to exfiltrate confidential data or compromise system integrity through malicious websites or email attachments. Telecom operators (STC, Mobily) and energy sector organizations may face operational disruption if Firefox is used in critical infrastructure environments.
🏢 Affected Saudi Sectors
Government (NCA-regulated entities)
Banking and Financial Services (SAMA-regulated)
Healthcare (MOH facilities)
Energy and Utilities (ARAMCO, power generation)
Telecommunications (STC, Mobily, Zain)
Education (universities, research institutions)
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 the organization, prioritizing government and financial systems
2. Disable Canvas2D functionality where possible through about:config (set gfx.canvas.azure.backends to 'skia' only if available)
3. Implement network-level controls to restrict access to untrusted websites
4. Block email attachments that could trigger canvas rendering
Patching Guidance:
5. Monitor Mozilla security advisories for patch releases (Firefox 149+, ESR 115.34+, ESR 140.9+, Thunderbird 149+)
6. Establish expedited patching procedures once patches are available
7. Test patches in isolated environments before enterprise deployment
Compensating Controls:
8. Deploy web content filtering to block known malicious domains
9. Implement endpoint detection and response (EDR) solutions to monitor for memory corruption exploitation attempts
10. Enforce browser sandboxing and process isolation features
11. Restrict Firefox/Thunderbird usage to essential personnel only
12. Monitor system logs for abnormal memory access patterns and crashes
Detection Rules:
13. Alert on Firefox/Thunderbird crashes with memory-related error codes
14. Monitor for suspicious canvas API calls in browser console logs
15. Track unauthorized data exfiltration attempts from browser processes
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع تثبيتات Firefox و Thunderbird عبر المنظمة، مع إعطاء الأولوية للأنظمة الحكومية والمالية
2. تعطيل وظيفة Canvas2D حيث أمكن من خلال about:config
3. تطبيق عناصر تحكم على مستوى الشبكة لتقييد الوصول إلى المواقع غير الموثوقة
4. حظر المرفقات البريدية التي قد تؤدي إلى عرض canvas
إرشادات التصحيح:
5. مراقبة تنبيهات أمان Mozilla للحصول على إصدارات التصحيح
6. إنشاء إجراءات تصحيح معجلة بمجرد توفر التصحيحات
7. اختبار التصحيحات في بيئات معزولة قبل النشر على مستوى المؤسسة
عناصر التحكم البديلة:
8. نشر تصفية محتوى الويب لحظر النطاقات الضارة المعروفة
9. تطبيق حلول الكشف والاستجابة على نقطة النهاية (EDR)
10. فرض ميزات الحماية الرملية وعزل العمليات
11. تقييد استخدام Firefox/Thunderbird للموظفين الأساسيين فقط
12. مراقبة سجلات النظام للأنماط غير الطبيعية للوصول إلى الذاكرة
قواعد الكشف:
13. تنبيهات عند تعطل Firefox/Thunderbird برموز خطأ متعلقة بالذاكرة
14. مراقبة استدعاءات canvas API المريبة في سجلات وحدة تحكم المتصفح
15. تتبع محاولات تسرب البيانات غير المصرح بها من عمليات المتصفح
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies (vulnerability management)
A.8.1.1 - User Endpoint Devices (secure browser configuration)
A.8.1.3 - Mobile Device Management (if Firefox used on mobile)
A.12.2.1 - Change Management (patch deployment procedures)
A.12.6.1 - Management of Technical Vulnerabilities (timely patching)
🔵 SAMA CSF
ID.RA-1 - Asset Management (inventory Firefox/Thunderbird)
PR.IP-12 - Security Awareness and Training (user notification)
PR.PT-2 - Protective Technology (browser security controls)
DE.CM-1 - Detection Processes (monitor for exploitation)
RS.RP-1 - Response Planning (incident response procedures)
🟡 ISO 27001:2022
A.12.2.1 - Change management procedures
A.12.6.1 - Management of technical vulnerabilities and exposures
A.14.2.1 - Secure development policy
A.16.1.5 - Response to information security incidents
🟣 PCI DSS v4.0.1
6.2 - Ensure security patches are installed within defined timeframe
11.2 - Run automated vulnerability scanning tools regularly
🔗 References & Sources 6
🔗
🔗
https://bugzilla.mozilla.org/show_bug.cgi?id=2015267
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