KnowledgeDeliver deployments before February 24, 2026 use a static ASP.NET/IIS machineKey value

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Summary

CVECVE-2026-5426
StatePUBLISHED
AssignerMandiant
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-16 16:16:17 UTC
Updated2026-05-26 19:16:29 UTC
DescriptionHard-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

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.000700000 probability, percentile 0.217030000 (date 2026-05-31)

Problem Types: CWE-321 | CWE-502 | CWE-321 CWE-321 Use of hard-coded cryptographic key | CWE-502 CWE-502 Deserialization of untrusted data

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Digital Knowledge KnowledgeDeliver affected 20260224 date Not specified

References

ReferenceSourceLinkTags
www.digital-knowledge.co.jp/product/kd [email protected] www.digital-knowledge.co.jp
cloud.google.com/blog/topics/threat-intelligence/knowledgedeliver-viewstate-de... [email protected] cloud.google.com
github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026... [email protected] github.com
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