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Vulnerabilities

CVE-2026-20195

Medium
CWE-204 — Weakness Type
Published: May 6, 2026  ·  Modified: May 9, 2026  ·  Source: NVD
CVSS v3
5.3
🔗 NVD Official
📄 Description (English)

A vulnerability in an identity management API endpoint of Cisco ISE could allow an unauthenticated, remote attacker to enumerate valid user accounts on an affected device.

This vulnerability exists because error messages are observed when the affected API endpoint is called. An attacker could exploit this vulnerability by sending a series of crafted requests to the affected endpoint and analyzing the differentiated responses. A successful exploit could allow the attacker to compile a list of valid usernames on an affected system.

🤖 AI Executive Summary

CVE-2026-20195 is a medium-severity information disclosure vulnerability in Cisco ISE identity management API that allows unauthenticated attackers to enumerate valid user accounts through error message analysis. While no exploit is currently available and no patch exists, the vulnerability poses a significant risk as it enables reconnaissance attacks that could facilitate subsequent unauthorized access attempts. Organizations using Cisco ISE should implement immediate compensating controls to restrict API endpoint access.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 30, 2026 04:11
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi banking institutions (SAMA-regulated banks), government agencies (NCA oversight), and large enterprises using Cisco ISE for identity and access management. The enumeration capability poses significant risk to organizations with sensitive user directories, particularly in financial services, telecommunications (STC, Mobily), and critical infrastructure sectors. The vulnerability enables credential stuffing and targeted phishing campaigns against identified valid accounts, potentially compromising SAMA-regulated systems and government networks under NCA jurisdiction.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Telecommunications Energy and Utilities Healthcare Large Enterprises with IAM infrastructure
⚖️ Saudi Risk Score (AI)
6.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all Cisco ISE deployments in your environment and document API endpoint exposure
2. Implement network-level access controls to restrict API endpoint access to authorized networks only
3. Enable API request logging and monitoring for suspicious enumeration patterns
4. Implement rate limiting on the affected API endpoint to prevent brute-force enumeration attempts

Compensating Controls (until patch available):
5. Deploy Web Application Firewall (WAF) rules to detect and block requests with error-based enumeration patterns
6. Implement IP whitelisting for API endpoint access, restricting to known administrative sources
7. Enable multi-factor authentication (MFA) for all ISE administrative accounts
8. Configure API response filtering to normalize error messages and prevent information leakage

Detection Rules:
9. Monitor for multiple failed API requests from single source IP addresses
10. Alert on API requests generating differentiated error responses
11. Track unusual patterns of API calls to identity endpoints
12. Implement SIEM rules to detect reconnaissance activity patterns

Long-term:
13. Subscribe to Cisco security advisories for patch availability
14. Plan for ISE upgrade once patch is released
15. Conduct user account audit to identify potentially compromised accounts
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع نشرات Cisco ISE في بيئتك وتوثيق تعريض نقاط نهاية واجهة برمجة التطبيقات
2. تطبيق ضوابط الوصول على مستوى الشبكة لتقييد الوصول إلى نقاط نهاية واجهة برمجة التطبيقات للشبكات المصرح بها فقط
3. تفعيل تسجيل مراقبة طلبات واجهة برمجة التطبيقات للأنماط المريبة للتعداد
4. تطبيق تحديد معدل على نقطة نهاية واجهة برمجة التطبيقات المتأثرة لمنع محاولات التعداد بالقوة الغاشمة

الضوابط التعويضية (حتى توفر التصحيح):
5. نشر قواعد جدار حماية تطبيقات الويب (WAF) للكشف عن أنماط التعداد القائمة على الأخطاء وحظرها
6. تطبيق القائمة البيضاء للعناوين IP لوصول نقطة نهاية واجهة برمجة التطبيقات، مع تقييد المصادر الإدارية المعروفة
7. تفعيل المصادقة متعددة العوامل (MFA) لجميع حسابات إدارة ISE
8. تكوين تصفية استجابة واجهة برمجة التطبيقات لتوحيد رسائل الخطأ ومنع تسرب المعلومات

قواعد الكشف:
9. مراقبة طلبات واجهة برمجة التطبيقات المتعددة الفاشلة من عناوين IP مصدر واحدة
10. التنبيه على طلبات واجهة برمجة التطبيقات التي تولد استجابات خطأ مختلفة
11. تتبع الأنماط غير العادية لاستدعاءات واجهة برمجة التطبيقات إلى نقاط نهاية الهوية
12. تطبيق قواعد SIEM للكشف عن أنماط نشاط الاستطلاع

المدى الطويل:
13. الاشتراك في تنبيهات أمان Cisco لتوفر التصحيح
14. التخطيط لترقية ISE بمجرد إصدار التصحيح
15. إجراء تدقيق حساب المستخدم لتحديد الحسابات المحتمل اختراقها
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 - 5.1.1: Access Control and Authentication ECC 2024 - 5.2.1: User Identification and Authentication ECC 2024 - 5.3.1: Access Rights Management ECC 2024 - 6.1.1: Information Security Monitoring
🔵 SAMA CSF
SAMA CSF - ID.AM-1: Physical and cyber assets are inventoried SAMA CSF - PR.AC-1: Identities and credentials are issued and managed SAMA CSF - PR.AC-2: Physical access is managed SAMA CSF - DE.AE-1: A baseline of network operations is established
🟡 ISO 27001:2022
ISO 27001:2022 - A.5.2: User registration and de-registration ISO 27001:2022 - A.5.3: Access rights review ISO 27001:2022 - A.8.2: User access management ISO 27001:2022 - A.8.3: User responsibilities
🟣 PCI DSS v4.0.1
PCI DSS 3.2.1: Render PAN unreadable PCI DSS 7.1: Limit access to system components by business need to know PCI DSS 8.1: Assign unique ID to each person with computer access
📊 CVSS Score
5.3
/ 10.0 — Medium
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityL — Low / Local
IntegrityN — None / Network
AvailabilityN — None / Network
📋 Quick Facts
Severity Medium
CVSS Score5.3
CWECWE-204
EPSS0.04%
Exploit No
Patch ✗ No
Published 2026-05-06
Source Feed nvd
🇸🇦 Saudi Risk Score
6.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-204
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