CVE-2026-20195: Cisco Identity Services Engine

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 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.

Affected products

• Cisco Identity Services Engine: up to and including 3.2.0; version 3.3.0 only; version 3.4.0 only; version 3.5.0 only

Published 2026-05-06. Last modified 2026-06-29.