KnowledgeDeliver deployments before February 24, 2026 use a static ASP.NET/IIS machineKey value
Priority MEDIUM 49CWE-321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass, Code execution
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-321 and CWE-502.
Summary
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
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01008 63rd percentileScored 2026-11-07
Fix Fixed KnowledgeDeliver (Digital Knowledge): 20260224
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Digital Knowledge | KnowledgeDeliver | before 20260224 | 20260224 | Patch available | CNA |
- KnowledgeDeliver VendorDigital Knowledge Affected before 20260224 Fixed in 20260224 Patch available CNA
Remediation
- Fix · CNA KnowledgeDeliver (Digital Knowledge) Fixed in 20260224
Timeline
- 2026-10-02 Threatist record created from CVE-2026-5426
- 2026-10-03 Alias added: GHSA-g88c-8gfj-6c98
References
Sources
- CVE-2026-5426 · CVE Program
- CVE-2026-5426 · NVD
- FIRST EPSS
- GHSA-g88c-8gfj-6c98 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences