CVE-2026-5426

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

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

Affected

Digital Knowledge · KnowledgeDeliver

CVSS v3.1 CNA

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

EPSS

0.81% chance of exploitation in the next 30 days, 56th percentile

Published

2026-04-16

Updated

2026-05-27

Proof-of-concept exploits (1)

• HORKimhab/CVE-2026-54260★ · 2026-06-17

References

• CVE Record
• NVD entry