CVE-2026-20195

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-unauth-bypass-uxjRXGpb

Configurations

No configuration.

History

06 May 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-06 17:16

Updated : 2026-06-17 10:17

NVD link : CVE-2026-20195

Mitre link : CVE-2026-20195

CVE.ORG link : CVE-2026-20195

JSON object : View

Products Affected

No product.

CWE

CWE-204

Observable Response Discrepancy

{"id": "CVE-2026-20195", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20195", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-06T17:34:47.638851Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "psirt@cisco.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "psirt@cisco.com", "affectedData": [{"vendor": "Cisco", "product": "Cisco Identity Services Engine Software", "versions": [{"status": "affected", "version": "3.3.0"}, {"status": "affected", "version": "3.3 Patch 2"}, {"status": "affected", "version": "3.3 Patch 1"}, {"status": "affected", "version": "3.3 Patch 3"}, {"status": "affected", "version": "3.4.0"}, {"status": "affected", "version": "3.3 Patch 4"}, {"status": "affected", "version": "3.4 Patch 1"}, {"status": "affected", "version": "3.3 Patch 5"}, {"status": "affected", "version": "3.3 Patch 6"}, {"status": "affected", "version": "3.4 Patch 2"}, {"status": "affected", "version": "3.3 Patch 7"}, {"status": "affected", "version": "3.4 Patch 3"}, {"status": "affected", "version": "3.5.0"}, {"status": "affected", "version": "3.4 Patch 4"}, {"status": "affected", "version": "3.3 Patch 8"}, {"status": "affected", "version": "3.5 Patch 1"}, {"status": "affected", "version": "3.3 Patch 9"}, {"status": "affected", "version": "3.4 Patch 5"}, {"status": "affected", "version": "3.5 Patch 3"}, {"status": "affected", "version": "3.5 Patch 2"}, {"status": "affected", "version": "3.3 Patch 10"}], "defaultStatus": "unknown"}]}], "published": "2026-05-06T17:16:21.630", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-unauth-bypass-uxjRXGpb", "source": "psirt@cisco.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-204"}]}], "descriptions": [{"lang": "en", "value": "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.\r\n\r\nThis 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."}], "lastModified": "2026-06-17T10:17:17.017", "sourceIdentifier": "psirt@cisco.com"}