Breaking Claude Code Opus 5 Auto Mode

<p>In this post, we explore how a simple website summary request hijacks <code>Claude Code Opus 5</code> in <code>Auto Mode</code> and achieves code execution with 60-80% attack success rate using a small sample size.</p> <p><a href="https://embracethered.com/blog/images/2026/claude-automode/claude-auto-mode-rce.png"><img alt="Breaking Claude Code Opus 5 Auto Mode" src="https://embracethered.com/b