CVE-2026-5426: critical vulnerability in Digital Knowledge KnowledgeDeliver
KnowledgeDeliver deployments before February 24, 2026 use a static ASP.NET/IIS machineKey value
Published · Updated
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70Vexday Risk Score
Prioritize patching. It exploitation observed by VulnCheck and has a public proof of concept.
ssvc Actcvss 9.1epss 1.0%
from disclosure to weapon40 days
Published on NVDApr 16
1st PoC+40d
VulnCheck+39d
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/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
Digital Knowledge · KnowledgeDeliverpublic PoCs found — 1
githubgithub.com/HORKimhab/CVE-2026-5426★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.