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

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Cisco / Cisco Identity Services Engine Software	affected 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

Vendor / product

Versions

Cisco / Cisco Identity Services Engine Software

affected 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

CWE

CWE-204

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.