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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco Identity Services Engine Software unknown
Version Status Constraints
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 —
3.3 Patch 6 affected —
3.4 Patch 2 affected —
3.3 Patch 7 affected —
3.4 Patch 3 affected —
3.5.0 affected —
3.4 Patch 4 affected —
3.3 Patch 8 affected —
3.5 Patch 1 affected —
3.3 Patch 9 affected —
3.4 Patch 5 affected —
3.5 Patch 3 affected —
3.5 Patch 2 affected —
3.3 Patch 10 affected —

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-unauth-bypass-uxjRXGpb cve-icon cve-icon
History

Wed, 06 May 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 06 May 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Cisco Identity Services Engine Observable Response Discrepancy Vulnerability
Weaknesses CWE-204
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-05-06T17:48:38.355Z

Reserved: 2025-10-08T11:59:15.396Z

Link: CVE-2026-20195

cve-icon Vulnrichment

Updated: 2026-05-06T17:35:02.527Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-06T17:16:21.630

Modified: 2026-05-06T18:59:53.230

Link: CVE-2026-20195

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-06T18:00:12Z

Weaknesses