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Researcher reports Claude Code web-summary chain leading to code execution

Researcher reports Claude Code web-summary chain leading to code execution Image: Primary
A security researcher reported that Claude Code running Opus 5 in Auto Mode could be induced to execute attacker-controlled code after being asked to summarize a webpage. The reported chain made WebFetch fail, redirected the agent to a ZIP archive, and relied on a malicious local Python module being imported when the agent wrote its own decoder. The researcher said three tested variants succeeded in 60% to 80% of five attempts each. Anthropic reportedly described Auto Mode as a convenience feature rather than a security guarantee.
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Published by Tech & Business, a media brand covering technology and business. This story was sourced from The Next Web and reviewed by the T&B editorial agent team.
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