📄 Description (English)
TinyMCE is an open source rich text editor. Prior to 5.11.1, 7.9.3, and 8.5.1, there is a stored XSS vulnerability via unsanitized data-mce-* attributes (data-mce-href, data-mce-src, data-mce-style). Allows attackers to inject malicious values that override safe attributes during serialization, bypassing validation. This vulnerability is fixed in 5.11.1, 7.9.3, and 8.5.1.
🤖 AI Executive Summary
TinyMCE versions prior to 5.11.1, 7.9.3, and 8.5.1 contain a stored XSS vulnerability through unsanitized data-mce-* attributes that bypass validation during serialization. Attackers can inject malicious values into data-mce-href, data-mce-src, and data-mce-style attributes to execute arbitrary JavaScript in users' browsers. This vulnerability affects numerous Saudi organizations using TinyMCE in content management systems, web applications, and customer-facing platforms. Immediate patching is critical to prevent account compromise and data theft.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 30, 2026 08:24
🇸🇦 Saudi Arabia Impact Assessment
High impact on Saudi banking sector (SAMA-regulated institutions) using TinyMCE in customer portals and internal systems; government agencies (NCA oversight) managing citizen-facing content platforms; healthcare organizations (MOH) storing patient communications; telecommunications providers (STC, Mobily) in customer service systems; e-commerce platforms and digital transformation initiatives. Stored XSS enables credential theft, session hijacking, malware distribution, and unauthorized access to sensitive customer data. Organizations in regulated sectors face compliance violations and potential SAMA/NCA enforcement actions.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Healthcare
Energy and Utilities
Telecommunications
E-commerce and Retail
Education
Media and Publishing
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all TinyMCE installations across your organization (check package.json, composer.json, npm registry, and application dependencies)
2. Document current versions in use and affected systems
3. Disable TinyMCE functionality if not immediately patchable
PATCHING GUIDANCE:
1. Upgrade to TinyMCE 5.11.1, 7.9.3, or 8.5.1 or later immediately
2. For npm: npm install tinymce@latest
3. For CDN users: update script src to latest version
4. Test thoroughly in staging environment before production deployment
5. Verify data-mce-* attributes are properly sanitized post-upgrade
COMPENSATING CONTROLS (if immediate patching impossible):
1. Implement Content Security Policy (CSP) headers: script-src 'self'; style-src 'self'
2. Apply input validation on all user-submitted content containing HTML
3. Use HTML sanitization library (DOMPurify, sanitize-html) on server-side
4. Disable data-mce-* attribute processing in serialization
5. Implement Web Application Firewall (WAF) rules to block data-mce-* payloads
DETECTION RULES:
1. Monitor for data-mce-href, data-mce-src, data-mce-style attributes in POST/PUT requests
2. Alert on javascript: protocol in data-mce-* attributes
3. Log all TinyMCE content modifications and serialization events
4. Search existing database records for stored data-mce-* attributes containing suspicious values
5. YARA rule: search for 'data-mce-(href|src|style).*javascript:' patterns
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع تثبيتات TinyMCE عبر المنظمة (تحقق من package.json و composer.json وسجل npm والمكتبات المرتبطة)
2. توثيق الإصدارات الحالية المستخدمة والأنظمة المتأثرة
3. تعطيل وظيفة TinyMCE إذا لم يكن من الممكن تصحيحها فوراً
إرشادات التصحيح:
1. الترقية إلى TinyMCE 5.11.1 أو 7.9.3 أو 8.5.1 أو إصدار أحدث فوراً
2. لـ npm: npm install tinymce@latest
3. لمستخدمي CDN: تحديث src البرنامج النصي إلى الإصدار الأحدث
4. اختبار شامل في بيئة التطوير قبل نشر الإنتاج
5. التحقق من تعقيم سمات data-mce-* بشكل صحيح بعد الترقية
الضوابط البديلة (إذا كان التصحيح الفوري مستحيلاً):
1. تطبيق رؤوس سياسة أمان المحتوى (CSP): script-src 'self'; style-src 'self'
2. تطبيق التحقق من الإدخال على جميع المحتوى الذي يحتوي على HTML المقدم من المستخدم
3. استخدام مكتبة تعقيم HTML على جانب الخادم (DOMPurify أو sanitize-html)
4. تعطيل معالجة سمات data-mce-* في التسلسل
5. تطبيق قواعد جدار الحماية لتطبيقات الويب (WAF) لحظر حمولات data-mce-*
قواعد الكشف:
1. مراقبة سمات data-mce-href و data-mce-src و data-mce-style في طلبات POST/PUT
2. التنبيه على بروتوكول javascript: في سمات data-mce-*
3. تسجيل جميع أحداث تعديل محتوى TinyMCE والتسلسل
4. البحث في سجلات قاعدة البيانات الموجودة عن سمات data-mce-* المخزنة التي تحتوي على قيم مريبة
5. قاعدة YARA: البحث عن أنماط 'data-mce-(href|src|style).*javascript:'
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
5.1.1 - Input validation and output encoding controls
5.2.1 - Web application security requirements
5.3.2 - Secure coding practices
6.1.1 - Vulnerability management and patching
🔵 SAMA CSF
ID.SC-7 - Software, firmware, and information integrity
PR.DS-6 - Integrity checking mechanisms
PR.IP-1 - System development and acquisition processes
DE.CM-8 - Vulnerability scans
🟡 ISO 27001:2022
A.14.2.1 - Secure development policy
A.14.2.5 - Secure development environment
A.14.3.1 - Separation of development, test and production environments
A.12.6.1 - Management of technical vulnerabilities
🟣 PCI DSS v4.0.1
6.5.1 - Injection flaws
6.5.7 - Cross-site scripting (XSS)
6.2 - Security patches and updates
🔗 References & Sources 3
🔗
https://github.com/tinymce/tinymce/security/advisories/GHSA-q742-qvgc-gc2f
security-advisories@github.com
Patch
Vendor Advisory
🔗
https://www.tiny.cloud/docs/tinymce/7/7.9.3-release-notes/#overview
security-advisories@github.com
Release Notes
🔗
https://www.tiny.cloud/docs/tinymce/8/8.5.1-release-notes/#overview
security-advisories@github.com
Release Notes
📦 Affected Products / CPE 3 entries
tiny:tinymce
tiny:tinymce
tiny:tinymce