CVE-2026-5426 KnowledgeDeliver deployments before February 24, 2026 use a static ASP.NET/IIS machineKey value
Attackers can achieve remote code execution by exploiting a hard-coded ASP.NET machineKey to bypass ViewState validation in KnowledgeDeliver.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5426?
CVE-2026-5426 is a critical vulnerability in Digital Knowledge KnowledgeDeliver, published on 16 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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
Which versions are affected by CVE-2026-5426?
How do I fix CVE-2026-5426?
No fix has been published for CVE-2026-5426 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-5426 being exploited?
There is no known exploitation of CVE-2026-5426 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-g88c-8gfj-6c98.