Medium 5.3Published May 6, 2026

CVE-2026-20195Cisco Identity Services Engine Observable Response Discrepancy Vulnerability

Updated under an hour ago (Oct 26, 2026, 7:30 AM ET)

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It affects Cisco Identity Services Engine Software and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Cisco Identity Services Engine Software

Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-204
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: cisco
NVD analysis: Analyzed
Record last updated: May 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Cisco Cisco Identity Services Engine Software cisco:identity_services_engine_software (from the name)	3.3.0; 3.3 Patch 2; 3.3 Patch 1; 3.3 Patch 3; 3.4.0; 3.3 Patch 4; 3.4 Patch 1; 3.3 Patch 5; and 13 more ranges	CNA record
cisco identity_services_engine cisco:identity_services_engine	through 3.2.0; 3.3.0; 3.3.0; 3.3.0; 3.3.0; 3.3.0; 3.3.0; 3.3.0; and 13 more ranges	NVD

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-unauth-bypass-uxjRXGpbvendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.