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CVE-2026-46331: Claude Cowork VM Sandbox Escape on macOS

CVE-2026-46331: Claude Cowork VM Sandbox Escape on macOS

ATLAS OWASP CRITICAL Active exploitation · Immediate action required ▲ 9.1 The Hacker News

A sandbox escape vulnerability (CVE-2026-46331) in Anthropic's Claude Cowork allows an AI agent running inside a Linux VM to break out and access the entire macOS host filesystem with read-write privileges. Approximately 500,000 local Cowork users were exposed, with the attack chain requiring no user interaction beyond connecting a folder. Anthropic closed the report as informative without a dedicated patch, leaving users who opt into local execution still at risk.

Anthropic Launches Claude Cowork Mobile with Remote Control

Anthropic Launches Claude Cowork Mobile with Remote Control

FIRST LOOK ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 7.2 BleepingComputer

Anthropic is expanding its Claude Cowork agentic desktop feature to mobile, enabling users to remotely initiate, monitor, and steer long-running AI tasks on their PC from a smartphone — with background task execution persisting even after the mobile app is closed. This cross-device architecture introduces a new attack surface: a mobile application acting as a command-and-control interface for an agent with local filesystem access, expanding the blast radius of device compromise, session hijacking, and prompt injection attacks. Defenders must now account for a persistent, background-running agentic process on employee endpoints that can be triggered or manipulated via a separate, potentially less-secured mobile channel.

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