CVE-2026-20195 Details
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.
A vulnerability exists in an identity management API endpoint of Cisco Identity Services Engine (ISE) that could allow an unauthenticated, remote attacker to enumerate valid user accounts on the affected device. This issue arises because the API endpoint returns error messages that can be used to differentiate between valid and invalid usernames. By sending a series of crafted requests and analyzing the responses, an attacker could compile a list of valid usernames on the system.
Cisco has released software updates to address this vulnerability. Users should upgrade to version 3.3 Patch 11, 3.4 Patch 6, or 3.5 Patch 3. For versions 3.2 and earlier, users should migrate to a fixed release.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 6, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-unauth-bypass-uxjRXGpb | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-204 | Observable Response Discrepancy | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| cisco identity services engine | <= 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 3.3.0 patch5 3.3.0 patch6 3.3.0 patch7 3.3.0 patch8 3.3.0 patch9 3.4.0 - 3.4.0 patch1 3.4.0 patch2 3.4.0 patch3 3.4.0 patch4 3.4.0 patch5 3.5.0 - 3.5.0 patch1 3.5.0 patch2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 29, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 6, 2026 | New CVE Received | [email protected] |