{"id":"CVE-2026-20071","aliases":["EUVD-2026-81158","GHSA-mc6q-xfc2-72q5"],"status":"published","title":"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\u0026nbsp;another user and access protected 802.1X networks. \u0026nbsp;\r\n\r\nThis 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\u0026nbsp;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.","severity":{"version":"3.1","score":3.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00233,"percentile":0.14277,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-290"],"published":"2026-09-16T20:20:46Z","modified":"2026-09-18T13:28:28Z","products":[{"vendor":"cisco","product":"cisco identity services engine software"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multi-vuln-kWLeNnRD"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20071"},{"url":"https://github.com/advisories/GHSA-mc6q-xfc2-72q5"}],"sources":{"cve":[{"id":"CVE-2026-20071","title":"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\u0026nbsp;another user and access protected 802.1X networks. \u0026nbsp;\r\n\r\nThis 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\u0026nbsp;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.","status":"published","published":"2026-09-16T20:20:46.923Z","modified":"2026-09-17T14:05:45.971Z","cvss":[{"version":"3.1","score":3.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T13:35:44.571002Z"}],"euvd":[{"id":"EUVD-2026-81158","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\u0026nbsp;another user and access protected 802.1X networks. \u0026nbsp;\r\n\r\nThis 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\u0026nbsp;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.","status":"published","published":"2026-09-16T20:20:46Z","modified":"2026-09-17T14:05:45Z","cvss":[{"version":"3.1","score":3.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T17:28:12.076337Z"}],"ghsa":[{"id":"GHSA-mc6q-xfc2-72q5","title":"A vulnerability in the SSID bring-your-own-device (BYOD) onboarding workflow of Cisco ISE could...","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\u0026nbsp;another user and access protected 802.1X networks. \u0026nbsp;\n\nThis 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\u0026nbsp;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.","status":"published","published":"2026-09-16T21:32:48Z","modified":"2026-09-16T21:32:55Z","cvss":[{"version":"3.1","score":3.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T15:12:02.095044Z"}],"nvd":[{"id":"CVE-2026-20071","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\u0026nbsp;another user and access protected 802.1X networks. \u0026nbsp;\r\n\r\nThis 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\u0026nbsp;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.","status":"published","published":"2026-09-16T21:17:07.087Z","modified":"2026-09-18T13:28:28.567Z","cvss":[{"version":"3.1","score":3.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T14:12:49.013904Z"}]}}