
ParaShells Vulnerability: When Virtualization Security Becomes a Privilege Escalation Pathway
In September 2026, JFrog's vulnerability research team discovered CVE-2026-90894, a local privilege escalation flaw in Parallels Desktop for Mac that allows non-administrative users to execute code with root privileges. The vulnerability, dubbed 'ParaShells,' exploits a world-writable socket in the prl_disp_service background service and uses argument injection in the virtual machine appliance installation process. While the attack requires local access, it poses significant risks in shared environments or when combined with other attack vectors like malicious Homebrew formulas or compromised npm scripts. This incident highlights the growing concern around local privilege escalation vulnerabilities in virtualization software, particularly as organizations increasingly rely on virtual machines for development and testing. The timing is especially critical as Apple has discontinued Intel Mac support in newer versions, leaving Intel-based systems without access to the patched version 27, creating a prolonged exposure window for legacy hardware deployments.
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