CVE-2026-20195
Cisco Identity Services Engine Observable Response Discrepancy Vulnerability
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) Check your version | Identity / IAM / MFA | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Identity Services Engine Software
Vendor advisory
cisco-sa-ise-unauth-bypass-uxjRXGpb
Cisco Identity Services Engine Authentication Bypass Vulnerabilities
Cisco’s rating: Medium (advisory CVSS 5.3) · Published May 6, 2026
Bug IDs: CSCwr77441 , CSCwr77445
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from