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CVE-2026-5426

CriticalPublished

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

Published: Apr 16, 2026
Updated: May 27, 2026
Assigning CNA: Mandiant
Evidence observed: Aug 17, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 61.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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

Sources

CVE-2026-5426Exploit
CVE-2026-5426

Responsible use

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