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Claude Code Leaks User Email in HTTP User-Agent Headers

Claude Code Leaks User Email in HTTP User-Agent Headers

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 7.2 Anthropic (via HN)

A confirmed bug in Anthropic's Claude Code agentic coding tool exposes users' email addresses to arbitrary third-party websites via the HTTP User-Agent request header during web searches. This constitutes an unsanctioned data disclosure that users cannot meaningfully prevent, creating a harvesting vector for spam and phishing campaigns. The issue has drawn significant community backlash, with nearly 500 upvotes on the GitHub issue, and raises broader concerns about privacy controls in agentic AI tooling.

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