CVE-2026-20195
Cisco Identity Services Engine Observable Response Discrepancy Vulnerability
Severity
Medium 5.3
CVSS 3.1
Exploited
Not listed
EPSS
0.003
19.5th percentile
Discovered by
Third party
Published by the vendor
Published
May 6, 2026
Assigned by cisco
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.
Weakness: CWE-204
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Identity Services Engine (ISE) | Identity / IAM / MFA | cna-assigner |
Vendor-reported affected versions (1)
- Cisco · Cisco Identity Services Engine Software