CVE-2026-5426 (GCVE-0-2026-5426)

Vulnerability from cvelistv5 – Published: 2026-04-16 15:18 – Updated: 2026-04-16 15:22
VLAI?
Title
KnowledgeDeliver deployments before February 24, 2026 use a static ASP.NET/IIS machineKey value
Summary
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
Severity ?
No CVSS data available.
CWE
  • CWE-321 - Use of hard-coded cryptographic key
  • CWE-502 - Deserialization of untrusted data
Assigner
Impacted products
Vendor Product Version
Digital Knowledge KnowledgeDeliver Affected: 0 , < 20260224 (date)
Create a notification for this product.
Show details on NVD website

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  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "KnowledgeDeliver",
          "vendor": "Digital Knowledge",
          "versions": [
            {
              "lessThan": "20260224",
              "status": "affected",
              "version": "0",
              "versionType": "date"
            }
          ]
        }
      ],
      "descriptions": [
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              "type": "text/html",
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            }
          ],
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        }
      ],
      "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",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-16T15:22:20.823Z",
        "orgId": "027e81ed-0dd4-4685-ab4d-884aec5bb484",
        "shortName": "Mandiant"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "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"
      },
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  "cveMetadata": {
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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": "2026-04-16T15:22:20.823Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-5426\",\"sourceIdentifier\":\"mandiant-cve@google.com\",\"published\":\"2026-04-16T16:16:17.693\",\"lastModified\":\"2026-04-16T16:16:17.693\",\"vulnStatus\":\"Received\",\"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\"}],\"metrics\":{},\"weaknesses\":[{\"source\":\"mandiant-cve@google.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-321\"},{\"lang\":\"en\",\"value\":\"CWE-502\"}]}],\"references\":[{\"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\"}]}}"
  }
}


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