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Vulnerabilities

CVE-2026-8599

Medium
CWE-79 — Weakness Type
Published: Jun 9, 2026  ·  Modified: Jun 10, 2026  ·  Source: NVD
CVSS v3
6.4
🔗 NVD Official
📄 Description (English)

The MailerPress – Email Marketing, Newsletter, Email Automation & WooCommerce Emails plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Campaign HTML Content Field in all versions up to, and including, 2.0.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The public-facing campaign preview endpoint (/mp-email/{id}-slug/) is not affected by this vulnerability, as it applies a Content-Security-Policy header blocking all inline scripts; exploitation is limited to the admin dashboard preview.

🤖 AI Executive Summary

MailerPress plugin versions up to 2.0.4 contain a Stored XSS vulnerability in the Campaign HTML Content Field allowing authenticated users with author-level access to inject malicious scripts in the WordPress admin dashboard. While the public-facing preview endpoint is protected by Content-Security-Policy headers, the admin dashboard remains vulnerable. This poses a significant risk to WordPress installations used by Saudi organizations for email marketing and newsletter campaigns.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Jun 9, 2026 14:03
🇸🇦 Saudi Arabia Impact Assessment
Saudi organizations in the following sectors are at elevated risk: (1) Banking & Financial Services - institutions using WordPress for customer communications and marketing; (2) E-commerce & Retail - companies leveraging WooCommerce with MailerPress for email automation; (3) Government & Public Sector - agencies using WordPress-based platforms for citizen communications; (4) Healthcare - medical facilities using email marketing for patient engagement; (5) Telecommunications - providers using WordPress for customer notifications. The vulnerability is particularly concerning for organizations with multiple WordPress administrators, as compromised author-level accounts can inject persistent malicious scripts affecting all admin users accessing the dashboard.
🏢 Affected Saudi Sectors
Banking & Financial Services E-commerce & Retail Government & Public Sector Healthcare Telecommunications Education Hospitality & Tourism Real Estate
⚖️ Saudi Risk Score (AI)
6.8
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Audit all MailerPress installations in your environment and identify versions up to 2.0.4
2. Review user access logs for suspicious campaign HTML modifications by author-level accounts
3. Inspect existing campaigns for suspicious JavaScript code in HTML content fields
4. Restrict author-level access to MailerPress campaign creation to trusted personnel only

PATCHING GUIDANCE:
1. Monitor MailerPress official repository for security updates beyond version 2.0.4
2. When patch becomes available, immediately update all affected installations
3. Test updates in staging environment before production deployment

COMPENSATING CONTROLS (until patch available):
1. Implement WordPress user role restrictions - limit campaign creation to administrator-only accounts
2. Deploy Web Application Firewall (WAF) rules to detect and block XSS patterns in admin requests
3. Enable WordPress security plugins with XSS detection capabilities (e.g., Wordfence, Sucuri)
4. Implement Content-Security-Policy headers at web server level for admin dashboard
5. Use WordPress security audit plugins to monitor campaign modifications
6. Implement IP whitelisting for WordPress admin access
7. Enable two-factor authentication for all WordPress user accounts

DETECTION RULES:
1. Monitor WordPress database for suspicious JavaScript patterns in wp_postmeta tables related to MailerPress campaigns
2. Alert on any campaign HTML modifications by non-administrator accounts
3. Log and review all access to /wp-admin/admin.php?page=mailerpress* endpoints
4. Monitor for script tags, event handlers (onclick, onload, etc.), and iframe injections in campaign content
5. Implement SIEM rules to detect XSS payloads in POST requests to MailerPress campaign endpoints
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تدقيق جميع تثبيتات MailerPress في بيئتك وتحديد الإصدارات حتى 2.0.4
2. مراجعة سجلات الوصول للتعديلات المريبة على HTML الحملات من قبل حسابات على مستوى المؤلف
3. فحص الحملات الموجودة بحثاً عن أكواد JavaScript مريبة في حقول محتوى HTML
4. تقييد وصول المؤلفين إلى إنشاء حملات MailerPress للموظفين الموثوقين فقط

إرشادات التصحيح:
1. مراقبة مستودع MailerPress الرسمي للتحديثات الأمنية بعد الإصدار 2.0.4
2. عند توفر التصحيح، قم بتحديث جميع التثبيتات المتأثرة فوراً
3. اختبر التحديثات في بيئة التطوير قبل نشرها في الإنتاج

الضوابط البديلة (حتى توفر التصحيح):
1. تنفيذ قيود أدوار مستخدمي WordPress - حصر إنشاء الحملات على حسابات المسؤول فقط
2. نشر قواعد جدار الحماية (WAF) للكشف عن أنماط XSS وحجبها في طلبات المسؤول
3. تفعيل مكونات أمان WordPress مع قدرات الكشف عن XSS
4. تنفيذ رؤوس Content-Security-Policy على مستوى خادم الويب
5. استخدام مكونات تدقيق أمان WordPress لمراقبة تعديلات الحملات
6. تنفيذ قائمة بيضاء للعناوين IP لوصول لوحة تحكم WordPress
7. تفعيل المصادقة متعددة العوامل لجميع حسابات مستخدمي WordPress

قواعد الكشف:
1. مراقبة قاعدة بيانات WordPress بحثاً عن أنماط JavaScript مريبة في جداول wp_postmeta المتعلقة بحملات MailerPress
2. التنبيه على أي تعديلات حملة HTML من قبل حسابات غير إدارية
3. تسجيل ومراجعة جميع الوصول إلى نقاط نهاية MailerPress
4. مراقبة حقن علامات البرنامج النصي ومعالجات الأحداث في محتوى الحملة
5. تنفيذ قواعس SIEM للكشف عن حمولات XSS في طلبات POST
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
5.1.1 - Input Validation and Data Sanitization 5.1.2 - Output Encoding and Escaping 5.2.1 - Web Application Security Controls 5.3.1 - Access Control and Authentication 6.1.1 - Security Monitoring and Logging
🔵 SAMA CSF
ID.GV-1 - Organizational cybersecurity policy and procedures PR.AC-1 - Access control policy and procedures PR.DS-1 - Data security policy and procedures DE.CM-1 - The network is monitored to detect potential cybersecurity events RS.MI-1 - Incidents are contained
🟡 ISO 27001:2022
A.5.1.1 - Policies for information security A.6.1.1 - Information security roles and responsibilities A.8.2.1 - User registration and de-registration A.8.2.2 - User access provisioning A.14.2.1 - Secure development policy A.14.2.5 - Secure development environment
🟣 PCI DSS v4.0.1
6.5.1 - Injection flaws 6.5.7 - Cross-site scripting (XSS) 6.2 - Security patches and updates 11.3 - Penetration testing
📊 CVSS Score
6.4
/ 10.0 — Medium
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeC — Changed
ConfidentialityL — Low / Local
IntegrityL — Low / Local
AvailabilityN — None / Network
📋 Quick Facts
Severity Medium
CVSS Score6.4
CWECWE-79
Exploit No
Patch ✗ No
Published 2026-06-09
Source Feed nvd
🇸🇦 Saudi Risk Score
6.8
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-79
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