Critical 9.1Published Apr 16, 2026

CVE-2026-5426KnowledgeDeliver deployments before February 24, 2026 use a static ASP.NET/IIS machineKey value

Updated under an hour ago (Oct 27, 2026, 12:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for Digital Knowledge KnowledgeDeliver

Exploited in the last 30 days

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: 9.1 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-321, CWE-502
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Mandiant
NVD analysis: Awaiting Analysis
Record last updated: May 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Digital Knowledge KnowledgeDeliver digital_knowledge:knowledgedeliver (from the name)	before 20260224	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.