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Vulnerabilities

Vulnerability · CVE-2026-20195

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.

Published May 6, 2026 · catalog updated Jun 29, 2026 · identity services engine

Check if you run it

No confirmed exploitation is on record for CVE-2026-20195. EPSS is 0.27%. Act only if a listed version of identity services engine is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.27%
Remediation
Advisory link
Affected products
cpe cisco/identity services engine

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/identity services engine3.3.0
  • cpe cisco/identity services engine3.4.0
  • cpe cisco/identity services engine3.5.0

How to fix CVE-2026-20195

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20195. EPSS is 0.27%. Act only if a listed version of identity services engine is installed.

Which versions are affected?

Compare what you have installed with cisco/identity services engine 3.3.0; cisco/identity services engine 3.4.0; cisco/identity services engine 3.5.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-204. EPSS 0.27%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 6, 2026 · NIST NVD

    Detected

    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

  2. Jun 29, 2026 · NIST NVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2026-20195

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20195

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20195

    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. A

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.