{"cvss":9.1,"datePublished":"2026-04-16T16:16:17.693","dateUpdated":"2026-10-26T21:10:00.170","description":"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","id":"CVE-2026-5426","raw":{"affected":[{"affectedData":[{"defaultStatus":"unaffected","product":"KnowledgeDeliver","vendor":"Digital Knowledge","versions":[{"lessThan":"20260224","status":"affected","version":"0","versionType":"date"}]}],"source":"mandiant-cve@google.com"}],"cveTags":[],"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"},{"lang":"es","value":"El valor de machineKey de ASP.NET/IIS codificado en duro en las implementaciones de Digital Knowledge KnowledgeDeliver anteriores al 24 de febrero de 2026 permite a los adversarios eludir los mecanismos de validación de ViewState y lograr la ejecución remota de código a través de ataques maliciosos de deserialización de ViewState."}],"id":"CVE-2026-5426","lastModified":"2026-10-26T21:10:00.170","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"exploitabilityScore":3.9,"impactScore":5.2,"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2026-5426","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","timestamp":"2026-05-26T17:08:59.810913Z","version":"2.0.3"}}]},"published":"2026-04-16T16:16:17.693","references":[{"source":"mandiant-cve@google.com","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/"}],"sourceIdentifier":"mandiant-cve@google.com","vulnStatus":"Awaiting Analysis","weaknesses":[{"description":[{"lang":"en","value":"CWE-321"},{"lang":"en","value":"CWE-502"}],"source":"mandiant-cve@google.com","type":"Secondary"}]},"severity":"CRITICAL","source":"nvd","title":"Hard-coded ASP.NET/IIS machineKey value in Digital Knowledge KnowledgeDeliver deployments prior to February 24, 2026 ..."}