CVE-2026-5426

{"id": "CVE-2026-5426", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-5426", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-05-26T17:08:59.810913Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "affected": [{"source": "mandiant-cve@google.com", "affectedData": [{"vendor": "Digital Knowledge", "product": "KnowledgeDeliver", "versions": [{"status": "affected", "version": "0", "lessThan": "20260224", "versionType": "date"}], "defaultStatus": "unaffected"}]}], "published": "2026-04-16T16:16:17.693", "references": [{"url": "https://cloud.google.com/blog/topics/threat-intelligence/knowledgedeliver-viewstate-deserialization-vulnerability", "source": "mandiant-cve@google.com"}, {"url": "https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0009.md", "source": "mandiant-cve@google.com"}, {"url": "https://www.digital-knowledge.co.jp/product/kd/", "source": "mandiant-cve@google.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "mandiant-cve@google.com", "description": [{"lang": "en", "value": "CWE-321"}, {"lang": "en", "value": "CWE-502"}]}], "descriptions": [{"lang": "en", "value": "Hard-coded ASP.NET/IIS machineKey value in Digital Knowledge KnowledgeDeliver deployments prior to February 24, 2026 allows adversaries to circumvent ViewState validation mechanisms and achieve remote code execution via malicious ViewState deserialization attacks"}], "lastModified": "2026-06-17T10:59:00.653", "sourceIdentifier": "mandiant-cve@google.com"}