# Researcher reports Claude Code Auto Mode exploit chain

_Monday, August 31, 2026 at 3:49 AM EDT · Security, AI · Latest · Tier 2 — Notable_

![Researcher reports Claude Code Auto Mode exploit chain — Primary](https://embracethered.com/blog/images/2026/claude-automode/claude-auto-mode-rce.png)

A security researcher reported a lab attack chain that led Claude Code Opus 5 in Auto Mode from a website-summary task to execution of a remote test payload, with observed 60% to 80% success rates in a small sample.

The reported chain used a downloaded archive and Python module shadowing after the agent wrote and ran its own decoder. The researcher said Anthropic closed the disclosure as informative and described Auto Mode as a convenience feature, with OS isolation and network-egress controls as the security boundary.

## Sources

- [Hacker News](https://embracethered.com/blog/posts/2026/breaking-claude-code-opus-5-and-automode/)

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Canonical: https://techandbusiness.org/newswire/6lf_ILp0jNeSkP5OVBoiZ0
Retrieved: 2026-08-31T12:41:22.881Z
Publisher: Tech & Business (techandbusiness.org)