Is CVE-2026-20195 being actively exploited?

CVE-2026-20195 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-20195?

CVE-2026-20195 has a CVSS 3.1 base score of 5.3 (MEDIUM).

CVE-2026-20195

MEDIUM · CVSS 5.3EPSS 0.3%EU EUVD

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.

Key facts

CVSS score: 5.3 (v3.1)
Severity: MEDIUM
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-204
EPSS score: 0.3% (19th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-27863)
Published: May 6, 2026
NVD last modified: June 29, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-27863 in the EU Vulnerability Database. Last updated in EUVD on May 6, 2026.

View on the EU Vulnerability Database

Affected products

cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine

Certified products that may be affected

3 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Cisco Identity Services Engine (ISE) V3.3 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11517-2025 - active
Cisco ISE v2.0 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-10795-2017 - archived
Cisco Identity Services Engine (ISE) v1.2 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10521-2014 - archived

References

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

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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