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
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Digital Knowledge | KnowledgeDeliver | < 20260224 | 20260224 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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HORKimhab/CVE-2026-5426 ★ 0 · May 26, 2026
CVE-2026-5426
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0009.md third-party-advisory
- https://www.digital-knowledge.co.jp/product/kd/ product
- https://cloud.google.com/blog/topics/threat-intelligence/knowledgedeliver-viewstate-deserialization-vulnerability third-party-advisory