CVE-2026-20071
ISE 802.1x Session Hijack Vulnerability
Description
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.
Weakness: CWE-290
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Identity Services Engine (ISE) Check your version | Identity / IAM / MFA | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Identity Services Engine Software
Vendor advisory
cisco-sa-ise-multi-vuln-kWLeNnRD
Cisco Identity Services Engine 802.1X Session Hijack and Information Disclosure Vulnerabilities
Cisco’s rating: Medium (advisory CVSS 4.9) · Published Sep 16, 2026
Bug IDs: CSCwp98022 , CSCwp98024
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from