CVE-2026-20071
ISE 802.1x Session Hijack Vulnerability
Published Sep 16, 2026
CVSS 3.1 · 3.8 Low
EPSS < 1%
KEV · Not listed
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.
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.
Affected Products
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CVE record
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NVD configurations
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Red Hat packages
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OpenCVE enrichment
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Cisco | Cisco Identity Services Engine Software | unknown |
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| Cisco | Identity Services Engine Software |
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Remediation
Tracking
Advisories
Metrics
No CVSS v4.0
Attack Vector Adjacent Network
Attack Complexity Low
Privileges Required None
Scope Changed
Confidentiality Impact None
Integrity Impact Low
Availability Impact None
User Interaction Required
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.233% probability within 30 days)
Exploitation none
Automatable no
Technical Impact partial
References
History
Sep 18, 2026 9:30 PM
First appearance in the feed. Affected vendors updated
View changes
| Type | Values Removed | Values Added |
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| First Time appeared |
Cisco
Cisco identity Services Engine Software |
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| Vendors & Products |
Cisco
Cisco identity Services Engine Software |
Sep 17, 2026 3:30 PM
Scoring metrics updated
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| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Sep 16, 2026 8:30 PM
Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | ISE 802.1x Session Hijack Vulnerability | |
| Weaknesses | CWE-290 | |
| References |
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| Metrics |
cvssV3_1
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Subscriptions
Weaknesses
