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Vulnerabilities

CVE-2026-21904

Medium
CWE-79 — Weakness Type
Published: Apr 9, 2026  ·  Modified: Apr 12, 2026  ·  Source: NVD
CVSS v3
6.1
🔗 NVD Official
📄 Description (English)

An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Juniper Networks Junos Space allows an attacker to inject script tags in the

list filter field that, when visited by another user, enables the attacker to execute commands with the target's permissions, including an administrator.

This issue affects all versions of Junos Space before 24.1R5 Patch V3.

🤖 AI Executive Summary

A stored XSS vulnerability in Juniper Networks Junos Space allows attackers to inject malicious scripts through the list filter field, enabling command execution with victim privileges including administrative access. This affects all versions before 24.1R5 Patch V3. While no public exploit is available, the vulnerability poses significant risk to organizations managing network infrastructure through Junos Space.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 24, 2026 05:37
🇸🇦 Saudi Arabia Impact Assessment
Saudi telecommunications operators (STC, Mobily, Zain) and large enterprises managing network infrastructure through Junos Space are at significant risk. Government entities under NCA oversight, ARAMCO and energy sector organizations, and financial institutions under SAMA supervision that rely on Junos Space for network management face potential compromise of administrative credentials and unauthorized command execution. The vulnerability could enable lateral movement within critical infrastructure networks.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain) Energy (ARAMCO, Saudi Electricity Company) Banking and Financial Services Government and Public Administration Healthcare Large Enterprises with Network Infrastructure Management
⚖️ Saudi Risk Score (AI)
7.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Junos Space deployments in your environment and document current versions
2. Restrict access to Junos Space administrative interfaces to trusted networks only
3. Implement network segmentation to isolate Junos Space from production systems
4. Enable comprehensive logging and monitoring of all Junos Space activities
5. Review user access logs for suspicious list filter field activities

PATCHING GUIDANCE:
1. Upgrade to Juniper Junos Space 24.1R5 Patch V3 or later immediately
2. If immediate patching is not possible, contact Juniper Networks for interim patches
3. Test patches in non-production environments before deployment

COMPENSATING CONTROLS (if patching delayed):
1. Implement Web Application Firewall (WAF) rules to detect and block script injection attempts in filter fields
2. Apply input validation and output encoding at the application layer
3. Disable or restrict the list filter functionality if not operationally critical
4. Enforce Content Security Policy (CSP) headers to prevent inline script execution
5. Implement multi-factor authentication for all administrative accounts

DETECTION RULES:
1. Monitor for script tags (<script>, javascript:, onerror=, onload=) in list filter field submissions
2. Alert on administrative command execution from non-standard user sessions
3. Track changes to filter configurations and stored filter values
4. Monitor for unusual administrative activity patterns following filter field modifications
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع نشرات Junos Space في بيئتك وتوثيق الإصدارات الحالية
2. تقييد الوصول إلى واجهات إدارة Junos Space على الشبكات الموثوقة فقط
3. تنفيذ تقسيم الشبكة لعزل Junos Space عن أنظمة الإنتاج
4. تفعيل السجلات الشاملة ومراقبة جميع أنشطة Junos Space
5. مراجعة سجلات وصول المستخدمين للأنشطة المريبة في حقل تصفية القائمة

إرشادات التصحيح:
1. الترقية إلى Juniper Junos Space 24.1R5 Patch V3 أو أحدث فوراً
2. إذا لم يكن التصحيح الفوري ممكناً، اتصل بـ Juniper Networks للحصول على تصحيحات مؤقتة
3. اختبر التصحيحات في بيئات غير الإنتاج قبل النشر

الضوابط البديلة (إذا تأخر التصحيح):
1. تنفيذ قواعد جدار حماية تطبيقات الويب (WAF) للكشف عن محاولات حقن النصوص البرمجية وحجبها
2. تطبيق التحقق من صحة الإدخال وترميز الإخراج على مستوى التطبيق
3. تعطيل أو تقييد وظيفة تصفية القائمة إذا لم تكن حرجة تشغيلياً
4. فرض رؤوس سياسة أمان المحتوى (CSP) لمنع تنفيذ النصوص البرمجية المضمنة
5. فرض المصادقة متعددة العوامل لجميع الحسابات الإدارية

قواعد الكشف:
1. مراقبة علامات النصوص البرمجية في عمليات إرسال حقل تصفية القائمة
2. التنبيه على تنفيذ الأوامر الإدارية من جلسات المستخدمين غير القياسية
3. تتبع التغييرات في تكوينات التصفية والقيم المخزنة
4. مراقبة أنماط النشاط الإداري غير العادية بعد تعديلات حقل التصفية
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control Policies ECC 2024 A.6.1.1 - Information Security Awareness ECC 2024 A.12.2.1 - Change Management ECC 2024 A.14.2.1 - Vulnerability Management
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Asset Management SAMA CSF PR.AC-1 - Access Control SAMA CSF PR.PT-1 - Security Testing SAMA CSF DE.CM-1 - Detection and Analysis
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Access Control ISO 27001:2022 A.8.1 - User Endpoint Devices ISO 27001:2022 A.8.22 - Monitoring ISO 27001:2022 A.12.6.1 - Management of Technical Vulnerabilities
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security Patches PCI DSS 6.5.7 - Cross-site Scripting PCI DSS 7.1 - Access Control
📊 CVSS Score
6.1
/ 10.0 — Medium
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionR — Required
ScopeC — Changed
ConfidentialityL — Low / Local
IntegrityL — Low / Local
AvailabilityN — None / Network
📋 Quick Facts
Severity Medium
CVSS Score6.1
CWECWE-79
EPSS0.04%
Exploit No
Patch ✗ No
Published 2026-04-09
Source Feed nvd
Views 6
🇸🇦 Saudi Risk Score
7.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-79
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