What’s Vulnerable › Vulnerabilities
CVE-2026-20195: Cisco Identity Services Engine Observable Response Discrepancy Vulnerability
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-06 · updated 2026-10-26
- Weakness: CWE-204
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.
Affected products
- Cisco Identity Services Engine: through 3.2.0; 3.3.0, 3.3.0-patch1, 3.3.0-patch10, 3.3.0-patch2, 3.3.0-patch3, 3.3.0-patch4 (+14)
References
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