Vulnerability Description
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
CRITICAL
Related Weaknesses (CWE)
References
- https://cloud.google.com/blog/topics/threat-intelligence/knowledgedeliver-viewst
- https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026
- https://www.digital-knowledge.co.jp/product/kd/
FAQ
What is CVE-2026-5426?
CVE-2026-5426 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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...
How severe is CVE-2026-5426?
CVE-2026-5426 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-5426?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.