📄 Description (English)
The Otter Blocks plugin for WordPress is vulnerable to Purchase Verification Bypass in all versions up to, and including, 3.1.4. This is due to the 'get_customer_data' method relying on an unsigned 'o_stripe_data' cookie to determine Stripe product ownership for unauthenticated users. The 'check_purchase' method trusts this cookie data without performing server-side verification against the Stripe API for one-time 'payment' mode purchases. This makes it possible for unauthenticated attackers to bypass Stripe purchase-gated content visibility conditions by forging the 'o_stripe_data' cookie with a target product ID, which is publicly exposed in the checkout block's HTML source.
🤖 AI Executive Summary
The Otter Blocks WordPress plugin (versions ≤3.1.4) contains a critical authentication bypass vulnerability allowing unauthenticated attackers to forge cookies and access Stripe-gated content without payment. The vulnerability stems from trusting unsigned cookies without server-side Stripe API verification, enabling attackers to bypass purchase restrictions by manipulating the 'o_stripe_data' cookie with publicly exposed product IDs. This affects any WordPress site using Otter Blocks for payment-gated content delivery, particularly e-commerce and digital product platforms.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 5, 2026 02:17
🇸🇦 Saudi Arabia Impact Assessment
Saudi organizations at highest risk include: (1) E-commerce platforms and digital product retailers using Otter Blocks for payment-gated content; (2) Financial services and fintech companies offering digital products through WordPress; (3) Educational institutions and online training providers monetizing courses; (4) Media and publishing companies with subscription-based content; (5) Government digital service portals if using Otter Blocks for fee-based services. SAMA-regulated financial institutions offering digital products face compliance violations. NCA-regulated entities handling customer data through compromised payment gates face data protection breaches. STC and other telecom providers offering digital services are at moderate risk.
🏢 Affected Saudi Sectors
E-commerce and Digital Retail
Financial Services and Fintech
Education and Online Training
Media and Publishing
Government Digital Services
Telecommunications
Healthcare (if offering digital services)
Software as a Service (SaaS)
🎯 MITRE ATT&CK Techniques
T1110 - Brute Force
T1187 - Forced Authentication
T1556 - Modify Authentication Process
T1111 - Multi-Factor Authentication Interception
T1539 - Steal Web Session Cookie
T1550 - Use Alternate Authentication Material
T1550.004 - Use Alternate Authentication Material: Web Session Cookie
T1078 - Valid Accounts
T1078.001 - Valid Accounts: Default Accounts
T1199 - Trusted Relationship
T1566 - Phishing
T1598 - Phishing for Information
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Disable Otter Blocks plugin immediately if not critical to operations
2. Audit all Stripe-gated content access logs for suspicious cookie patterns (o_stripe_data with mismatched product IDs)
3. Review transaction logs for unauthorized access to premium content
4. Notify customers of potential unauthorized access to paid content
PATCHING GUIDANCE:
1. Contact Otter Blocks developers for security patch timeline
2. Monitor plugin repository for version 3.1.5+ security release
3. Do NOT upgrade to any version until official security patch is released
COMPENSATING CONTROLS (until patch available):
1. Implement server-side Stripe API verification: modify plugin code to call Stripe API for every purchase verification request, not relying on cookies
2. Add cryptographic signing to o_stripe_data cookie using HMAC-SHA256 with server-side secret key
3. Implement rate limiting on content access endpoints (max 10 requests/minute per IP)
4. Add IP-based geolocation restrictions if applicable to Saudi operations
5. Implement Web Application Firewall (WAF) rules to detect cookie tampering patterns
6. Enable Stripe webhook verification for all payment events
7. Log all cookie-based access attempts with full request context
DETECTION RULES:
1. Monitor for o_stripe_data cookies with product IDs not matching user purchase history
2. Alert on unauthenticated requests accessing premium content endpoints
3. Flag requests with modified/forged cookie signatures
4. Track access to content from IPs without corresponding Stripe payment records
5. Monitor for rapid sequential access to different product IDs from same IP
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تعطيل مكون Otter Blocks فورًا إذا لم يكن حرجًا للعمليات
2. تدقيق جميع سجلات الوصول إلى المحتوى المحمي بـ Stripe للبحث عن أنماط ملفات تعريف الارتباط المريبة
3. مراجعة سجلات المعاملات للوصول غير المصرح به إلى المحتوى المميز
4. إخطار العملاء بالوصول المحتمل غير المصرح به إلى المحتوى المدفوع
إرشادات التصحيح:
1. الاتصال بمطوري Otter Blocks للحصول على جدول زمني لتصحيح الأمان
2. مراقبة مستودع المكون للإصدار 3.1.5+ إصدار أمان
3. عدم الترقية إلى أي إصدار حتى يتم إصدار تصحيح أمان رسمي
الضوابط التعويضية (حتى توفر التصحيح):
1. تنفيذ التحقق من جانب الخادم عبر واجهة برمجة تطبيقات Stripe: تعديل كود المكون للاتصال بـ Stripe API لكل طلب تحقق من الشراء
2. إضافة التوقيع التشفيري إلى ملف تعريف الارتباط o_stripe_data باستخدام HMAC-SHA256
3. تنفيذ تحديد معدل على نقاط نهاية الوصول إلى المحتوى
4. إضافة قيود الموقع الجغرافي القائمة على IP إذا كانت قابلة للتطبيق
5. تنفيذ قواعد جدار الحماية لاكتشاف أنماط تزوير ملفات تعريف الارتباط
6. تفعيل التحقق من webhook Stripe لجميع أحداث الدفع
7. تسجيل جميع محاولات الوصول القائمة على ملفات تعريف الارتباط
قواعد الكشف:
1. مراقبة ملفات تعريف الارتباط o_stripe_data بمعرفات منتجات لا تطابق سجل الشراء
2. تنبيهات الطلبات غير المصرح لها للوصول إلى نقاط نهاية المحتوى المميز
3. وضع علامة على الطلبات ذات التوقيعات المعدلة أو المزيفة
4. تتبع الوصول إلى المحتوى من عناوين IP بدون سجلات دفع Stripe المقابلة
5. مراقبة الوصول المتسلسل السريع إلى معرفات منتجات مختلفة من نفس IP
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.6.1.1 - Access control policy
A.6.2.1 - User registration and access rights management
A.6.2.2 - Privileged access rights
A.7.1.1 - Cryptography policy
A.8.2.1 - User authentication
A.8.2.3 - Password management
A.9.2.1 - User access management
A.9.4.1 - Access control review
A.12.4.1 - Event logging
A.12.4.3 - Administrator and operator logs
🔵 SAMA CSF
ID.AM-1 - Asset Management
PR.AC-1 - Access Control Policy
PR.AC-2 - Physical and Logical Access Controls
PR.AC-3 - Access Enforcement
PR.AC-4 - Access Rights Management
PR.AC-5 - Identification and Authentication
PR.PT-2 - Security Configuration Management
DE.AE-1 - Audit and Accountability
DE.CM-1 - System Monitoring
🟡 ISO 27001:2022
5.15 - Access control
5.16 - Identification and authentication
5.17 - Access rights
5.18 - Information security in supplier relationships
6.5 - Cryptography
8.2 - Information security event management
8.3 - Improvement of information security incident management
A.5.1.1 - Policies for information security
A.6.1.1 - Information security roles and responsibilities
A.6.2.1 - Information security coordination
A.7.1.1 - Cryptographic controls
A.8.2.1 - User endpoint devices
A.8.3.1 - Password management
A.9.2.1 - User access management
A.9.4.1 - Access rights review
A.12.4.1 - Event logging
🟣 PCI DSS v4.0.1
1.1 - Firewall configuration standards
2.1 - Default security parameters
2.2.4 - Configure system security parameters
6.2 - Ensure security patches are installed
6.5.10 - Broken authentication
7.1 - Limit access to system components
7.2 - Establish access for users
8.1 - Assign unique ID to each person
8.2 - Ensure proper user authentication
8.3 - Restrict access to cardholder data
10.1 - Implement audit trails
10.2 - Implement automated audit trails
🔗 References & Sources 5
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https://plugins.trac.wordpress.org/browser/otter-blocks/trunk/inc/plugins/class-block-c...
security@wordfence.com
https://plugins.trac.wordpress.org/browser/otter-blocks/trunk/inc/plugins/class-stripe-...
security@wordfence.com
https://plugins.trac.wordpress.org/browser/otter-blocks/trunk/inc/plugins/class-stripe-...
security@wordfence.com
https://plugins.trac.wordpress.org/changeset/3471326/
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/3443950f-1f94-4e0b-8906-1a9b9...
security@wordfence.com