cve-2026-5426

{
  "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 ..."
}