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Vulnerabilities

Vulnerability · CVE-2026-5426

Use of Hard-coded Cryptographic Key

Published Apr 16, 2026 · catalog updated Jun 17, 2026 · Digital Knowledge KnowledgeDeliver

Patch now

CVE-2026-5426 is in the CISA known-exploited catalog. Confirm Digital Knowledge KnowledgeDeliver against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.1
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.81%
Remediation
Remediation guidance
Affected products
vendor Digital Knowledge KnowledgeDeliver

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Digital Knowledge KnowledgeDeliverversion unspecified

How to fix CVE-2026-5426

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-5426 is in the CISA known-exploited catalog. Confirm Digital Knowledge KnowledgeDeliver against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-321; CWE-502: Deserialization of Untrusted Data. EPSS 0.81%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 16, 2026 · NIST NVD

    Detected

    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

  2. May 25, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  3. Jun 17, 2026 · NIST NVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2026-5426

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-5426

    30-day exploitation probability 0.8%

    first.org
  • NIST NVDVulnerability recordCVE-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 deserialization attacks

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-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 deserialization attacks

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.