Vulnerability intelligence
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 Score
7.5
High
EPSS — Exploit Probability
1.0%
Riskier than 61% of all CVEs · checked 2026-09-04
Exploitation
Not in CISA KEV
KEV does not include every exploited vulnerability
Remediation
unknown
Check vendor advisories
3 articles across 3 outlets · first covered May 25, 2026 · latest May 26, 2026
Coverage timeline
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Hackers Exploited KnowledgeDeliver Zero-Day for Web Shell Deploymentwww.securityweek.com · May 26, 2026
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CVE-2026-5426 Flaw Lets Attackers Hijack Knowledge Deliver LMSsecurityonline.info · May 25, 2026
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KnowledgeDeliver hit by CVE-2026-5426, allowing RCE attackscloud.google.com · May 25, 2026