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CVE-2026-20193— Cisco Identity Services Engine Authentication Bypass Vulnerability

Quick assessment

Affected
Cisco Cisco Identity Services Engine Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco ISE是美国思科（Cisco）公司的一个 NAC 解决方案。用于管理零信任架构中的端点、用户和设备对网络资源的访问。 Cisco ISE存在安全漏洞，该漏洞源于RADIUS Policy API端点上基于角色的访问控制权限不当，可能导致具有只读管理员权限的经过身份验证的远程攻击者绕过Web管理界面直接调用受影响端点，获取未授权的敏感信息访问。

CVSS 4.3 · Medium EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 21

VendorProduct Version RangeStatus
Cisco Cisco Identity Services Engine Software 3.3.0 affected
3.3 Patch 2 affected
3.3 Patch 1 affected
3.3 Patch 3 affected
3.4.0 affected
3.3 Patch 4 affected
3.4 Patch 1 affected
3.3 Patch 5 affected
… +13 more rows
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I. Basic Information for CVE-2026-20193

Vulnerability Information
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Vulnerability Title
Cisco Identity Services Engine Authentication Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the RADIUS Policy API endpoints of Cisco ISE could allow an authenticated, remote attacker with read-only Administrator privileges to gain unauthorized access to sensitive information on an affected device. This vulnerability is due to improper role-based access control (RBAC) permissions on the RADIUS Policy API endpoints. An attacker could exploit this vulnerability by bypassing the web-based management interface and directly calling an affected endpoint. A successful exploit could allow the attacker to gain unauthorized read access to sensitive RADIUS Policy details that are restricted for their role.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco ISE 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco ISE是美国思科（Cisco）公司的一个 NAC 解决方案。用于管理零信任架构中的端点、用户和设备对网络资源的访问。 Cisco ISE存在安全漏洞，该漏洞源于RADIUS Policy API端点上基于角色的访问控制权限不当，可能导致具有只读管理员权限的经过身份验证的远程攻击者绕过Web管理界面直接调用受影响端点，获取未授权的敏感信息访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Identity Services Engine Software 3.3.0 -

II. Public POCs for CVE-2026-20193

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III. Intelligence Information for CVE-2026-20193

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Vendor Advisories for CVE-2026-20193 (1)

Same Patch Batch · Cisco · 2026-05-06 · 12 CVEs total

CVE-2026-20034 8.8 HIGH Cisco Unity Connection Remote Code Execution Vulnerability
CVE-2026-20185 7.7 HIGH Cisco SG350 and SG350X Series Managed Switches SNMP Denial of Service Vunerability
CVE-2026-20167 7.7 HIGH Cisco IoT Field Network Director Remote Device Denial of Service Vulnerability
CVE-2026-20035 7.2 HIGH Cisco Unity Connection Server-Side Request Forgery Vulnerability
CVE-2026-20168 6.5 MEDIUM Cisco IoT Field Network Director Path Traversal Vulnerability
CVE-2026-20169 6.4 MEDIUM Cisco IoT Field Network Director Command Injection Vulnerability
CVE-2026-20219 5.4 MEDIUM Cisco Slido 安全漏洞
CVE-2026-20195 5.3 MEDIUM Cisco Identity Services Engine Observable Response Discrepancy Vulnerability
CVE-2026-20189 4.3 MEDIUM Cisco Prime Infrastructure Information Disclosure Vulnerability
CVE-2026-20172 4.3 MEDIUM Cisco Enterprise Chat and Email Lite Agent File Upload Vulnerability
CVE-2026-20188 Cisco Crosswork Network Controller and Cisco Network Services Orchestrator Advisory

IV. Related Vulnerabilities

Same product: Cisco Identity Services Engine Software
Same vendor: Cisco
Same weakness: CWE-862

V. Comments for CVE-2026-20193

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