---
id: CVE-2026-20071
title: >-
  A vulnerability in the SSID bring-your-own-device (BYOD) onboarding workflow
  of Cisco ISE could allow an unauthenticated, adjacent attacker to hijack the
  onboarding session of another user and access protected 802.1X networks
summary: >-
  A vulnerability in the SSID bring-your-own-device (BYOD) onboarding workflow
  of Cisco ISE could allow an unauthenticated, adjacent attacker to hijack the
  onboarding session of another user and access protected 802.1X networks.
  &nbsp…
severity: low
cvss: 3.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N'
cwe:
  - CWE-290
vendor: Cisco
product: Cisco Identity Services Engine Software
affected:
  - identity_services_engine_software 3.1.0
  - identity_services_engine_software 3.1.0 p1
  - identity_services_engine_software 3.1.0 p3
  - identity_services_engine_software 3.1.0 p2
  - identity_services_engine_software 3.2.0
  - identity_services_engine_software 3.1.0 p4
  - identity_services_engine_software 3.1.0 p5
  - identity_services_engine_software 3.2.0 p1
  - identity_services_engine_software 3.1.0 p6
  - identity_services_engine_software 3.2.0 p2
  - identity_services_engine_software 3.1.0 p7
  - identity_services_engine_software 3.3.0
  - identity_services_engine_software 3.2.0 p3
  - identity_services_engine_software 3.2.0 p4
  - identity_services_engine_software 3.1.0 p8
  - identity_services_engine_software 3.2.0 p5
  - identity_services_engine_software 3.2.0 p6
  - identity_services_engine_software 3.1.0 p9
  - identity_services_engine_software 3.3 Patch 2
  - identity_services_engine_software 3.3 Patch 1
  - identity_services_engine_software 3.3 Patch 3
  - identity_services_engine_software 3.4.0
  - identity_services_engine_software 3.2.0 p7
  - identity_services_engine_software 3.3 Patch 4
  - identity_services_engine_software 3.4 Patch 1
  - identity_services_engine_software 3.1.0 p10
  - identity_services_engine_software 3.3 Patch 5
  - identity_services_engine_software 3.3 Patch 6
  - identity_services_engine_software 3.4 Patch 2
  - identity_services_engine_software 3.3 Patch 7
  - identity_services_engine_software 3.4 Patch 3
  - identity_services_engine_software 3.5.0
  - identity_services_engine_software 3.4 Patch 4
  - identity_services_engine_software 3.3 Patch 8
  - identity_services_engine_software 3.2 Patch 8
  - identity_services_engine_software 3.5 Patch 1
  - identity_services_engine_software 3.3 Patch 9
  - identity_services_engine_software 3.2 Patch 9
  - identity_services_engine_software 3.4 Patch 5
  - identity_services_engine_software 3.5 Patch 3
  - identity_services_engine_software 3.5 Patch 2
  - identity_services_engine_software 3.3 Patch 10
  - identity_services_engine_software 3.3 Patch 11
  - identity_services_engine_software 3.4 Patch 6
  - identity_services_engine_software 3.2 Patch 10
  - identity_services_engine_software 3.1.0 p72
  - identity_services_engine_software 3.1.0 p11
  - identity_services_engine_software 3.3 Patch 12
published: '2026-09-16'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T13:28:28.567'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20071'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multi-vuln-kWLeNnRD
    label: psirt@cisco.com
  - url: 'https://software.cisco.com'
tags:
  - nvd
  - cve.org
  - csaf
  - vendor-advisory
  - cisco
epss: 0.00146
epssPercentile: 0.04197
ingestedAt: '2026-09-16T16:37:52.178Z'
---

## Overview

A vulnerability in the SSID bring-your-own-device (BYOD) onboarding workflow of Cisco ISE could allow an unauthenticated, adjacent attacker to hijack the onboarding session of another user and access protected 802.1X networks.  

This vulnerability is due to insufficient authentication checks that are performed while a user is being onboarded. An attacker could exploit this vulnerability by spoofing the legitimate user and triggering a redirection to the guest web portal. A successful exploit could allow the attacker to take over the user session and gain access to the protected 802.1X network.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **cisco-sa-ise-multi-vuln-kWLeNnRD** · Cisco · affected: Cisco Identity Services Engine Software (47 versions) · updated 2026-09-16 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multi-vuln-kWLeNnRD)