A February 2026 campaign exploited Ivanti EPMM vulnerabilities (CVE-2026-1281, CVE-2026-1340) to deploy dormant backdoors at /mifs/403.jsp. Instead of immediate exploitation, attackers planted an in-memory Java class loader that waits for a specific trigger parameter to load second-stage payloads. The implant never touches
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# The Vulnerabilities# The 403.jsp Campaign# Inside base.Info - The In-Memory Loader# What To Look For# Indicators of Compromise# The Quiet Ones Are WorseSort: