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          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
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            "other": {
              "content": {
                "id": "CVE-2026-5426",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
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                "timestamp": "2026-04-18T02:30:29.158302Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "KnowledgeDeliver",
          "vendor": "Digital Knowledge",
          "versions": [
            {
              "lessThan": "20260224",
              "status": "affected",
              "version": "0",
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          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "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"
            }
          ],
          "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"
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-586",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-586 Object Injection"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-321",
              "description": "CWE-321 Use of hard-coded cryptographic key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502 Deserialization of untrusted data",
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              "type": "CWE"
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          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-16T15:22:20.823Z",
        "orgId": "027e81ed-0dd4-4685-ab4d-884aec5bb484",
        "shortName": "Mandiant"
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      "references": [
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          "tags": [
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          "url": "https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0009.md"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://www.digital-knowledge.co.jp/product/kd/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "KnowledgeDeliver deployments before February 24, 2026 use a static ASP.NET/IIS machineKey value",
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    "assignerShortName": "Mandiant",
    "cveId": "CVE-2026-5426",
    "datePublished": "2026-04-16T15:18:46.224Z",
    "dateReserved": "2026-04-02T14:20:13.588Z",
    "dateUpdated": "2026-04-18T02:31:32.234Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
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