CVE-2026-5426

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

State: Published
Severity: 9.1 Critical
Published: Apr 16, 2026
Updated: May 27, 2026
Reserved: Apr 2, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	CISA-ADP

Weaknesses

CWE-321 Use of hard-coded cryptographic key
CWE-502 Deserialization of untrusted data

Affected Products

Product	Versions
KnowledgeDeliverDigital Knowledge	before 20260224Affected

References

https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0009.mdthird-party-advisory
https://www.digital-knowledge.co.jp/product/kd/product
https://cloud.google.com/blog/topics/threat-intelligence/knowledgedeliver-viewstate-deserialization-vulnerabilitythird-party-advisory

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