How to fix EUVD-2026-23271?

Within 24 hours: Inventory all Digital Knowledge KnowledgeDeliver deployments and confirm current versions. Within 7 days: Apply vendor patch to upgrade all instances to February 24, 2026 release or later. Within 30 days: Conduct post-patch verification testing and review access logs for ViewState deserialization attempts (monitor for suspicious Base64-encoded payloads in POST requests to .aspx pages). Implement network segmentation to restrict KnowledgeDeliver access to authorized users only.

Is Deserialization affected by EUVD-2026-23271?

Digital Knowledge KnowledgeDeliver contains a remote code execution vulnerability in ViewState deserialization affecting all versions prior to February 24, 2026.

EUVD-2026-23271

| CVE-2026-5426 HIGH

2026-04-16 Mandiant

GHSA-g88c-8gfj-6c98

Deserialization RCE Knowledgedeliver

7.5

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Apr 18, 2026 - 04:22 vuln.today

CVSS Changed

Apr 18, 2026 - 04:22 NVD

7.5 (HIGH)

patch_available

Apr 16, 2026 - 17:02 EUVD

DescriptionNVD

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

AnalysisAI

Remote code execution in Digital Knowledge KnowledgeDeliver (all versions prior to February 24, 2026) via malicious ViewState deserialization. A hard-coded ASP.NET machineKey allows unauthenticated remote attackers to bypass ViewState validation and execute arbitrary code on the server. …

RemediationAI

Within 24 hours: Inventory all Digital Knowledge KnowledgeDeliver deployments and confirm current versions. Within 7 days: Apply vendor patch to upgrade all instances to February 24, 2026 release or later. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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EUVD-2026-23271 vulnerability details – vuln.today

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EUVD-2026-23271

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

Full analysis requires sign-in

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External POC / Exploit Code