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VulnerabilityPublished Updated

CVE-2026-5426: Digital Knowledge KnowledgeDeliver · Use of Hard-coded Cryptographic Key

Affects Digital Knowledge KnowledgeDeliverSource CVE Database V5

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Not known to be exploited · CVSS 9.1 Critical : upgrade to 20260224 as a priority.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
1.0% chance of exploitation in 30 days – higher than 62% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 20260224
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade Digital Knowledge KnowledgeDeliver to 20260224.

Affected software

ProductAffectedFixed in
Digital KnowledgeKnowledgeDeliverAffected
  • =0
Fixed in
  • 20260224

AI-suggested

If you cannot patch yet, organizations should consider mitigating exposure by restricting network access to affected systems and monitoring for suspicious activity related to ViewState deserialization. Avoid deploying vulnerable versions where possible.

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

References

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