CVE-2026-5426

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

CVSS 3.1

9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

1.0% chance of exploitation in the next 30 days; higher than 62% of CVEs (scores of 2026-10-26)

CWEs

CWE-321, CWE-502

Published

2026-04-16

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

References

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

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