Hackers Abuse KnowledgeDeliver LMS Flaw to Install BLUEBEAM Web Shell

Hackers are actively exploiting a critical vulnerability in the KnowledgeDeliver Learning Management System (LMS) to deploy the BLUEBEAM web shell, according to findings from Mandiant’s Google Threat Intelligence Group. The flaw, tracked as CVE-2026-5426, enables unauthenticated remote code execution through ASP.NET ViewState deserialization and has been observed in real-world attacks. KnowledgeDeliver LMS Flaw The vulnerability […] The post Hackers Abuse KnowledgeDeliver LMS Flaw to Install BLUEBEAM Web Shell appeared first on GBHackers Security | #1 Globally Trusted Cyber Security News Platform.