SimpleHelp RMM flaw could give attackers full access to managed endpoints (CVE-2026-48558)

A critical vulnerability (CVE-2026-48558) in SimpleHelp, a popular remote monitoring and management (RMM) tool, can be exploited remotely by unauthenticated attackers to create a new “Technician” account and use it to remote into managed endpoints, execute scripts, and more. Maliciously “forged” Technician account (Source: Horizon3.ai) The vulnerability CVE-2026-48558 is an authentication bypass flaw affecting SimpleHelp deployments configured to use OpenID Connect (OIDC) authentication.