CRITICALZero Day
Global

KnowledgeDeliver LMS Flaw Exploited to Deploy Godzilla and Cobalt Strike

·Source: The Hacker News

Updated:

Executive Summary

A now-patched high-severity security flaw affecting Digital Knowledge KnowledgeDeliver, a Learning Management System (LMS) popular in Japan, was exploited as a zero-day to deliver the Godzilla web shell and ultimately facilitate the deployment of Cobalt Strike Beacon. The vulnerability, tracked as CVE-2026-5426 (CVSS score: 7.5), stems from the use of hard-coded ASP.NET machine keys, leading to

Analysis

A now-patched high-severity security flaw affecting Digital Knowledge KnowledgeDeliver, a Learning Management System (LMS) popular in Japan, was exploited as a zero-day to deliver the Godzilla web shell and ultimately facilitate the deployment of Cobalt Strike Beacon. The vulnerability, tracked as CVE-2026-5426 (CVSS score: 7.5), stems from the use of hard-coded ASP.NET machine keys, leading to

Indicators of Compromise (1)

CVE (1)
CVE-2026-5426
NVDMITRE CVE
Source Attribution

Originally published by The Hacker News on May 26, 2026.

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