Deserialization in Digital Knowledge Knowledgedeliver
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…
EPSS: 0.001 (21.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Digital Knowledge Knowledgedeliver — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- mandiant-cve@google.com (third-party-advisory)
- mandiant-cve@google.com (product)
- mandiant-cve@google.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-5426?
- CVE-2026-5426 is a critical-severity vulnerability in Digital Knowledge Knowledgedeliver, classified under Use of Hard-coded Cryptographic Key. CVSS score: 9.1/10. Published 2026-04-16.
- How severe is CVE-2026-5426?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2026-5426 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.