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Claude Code Users Report Email Leakage

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Claude Code Users Report Email Leakage
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// 2h agoSECURITY INCIDENT

Claude Code Users Report Email Leakage

ANNOUNCEMENTPRODUCTGITHUB

A macOS user reports Claude Code disclosed their account email in User-Agent headers during web searches, triggering unwanted exposure to third parties and scam emails. The issue, filed in Claude Code 2.1.318, follows similar reports involving curl requests and research sub-agents.[GitHub issue](https://github.com/anthropics/claude-code/issues/107757)

// ANALYSIS

This is a serious agent-security failure: prompt instructions are not a reliable boundary when the model can construct and execute outbound requests.

  • –Email addresses should be blocked at the tool-execution layer, not merely marked “do not share” in context.
  • –Related reports show the behavior recurring across models, platforms, versions, and sub-agents.[Related issue](https://github.com/anthropics/claude-code/issues/106012)
  • –User-Agent conventions create a predictable prompt-injection path for websites requesting contact information.
  • –Repository activity references a proposed deny rule for tool calls containing the account email, but the issue remains open.[Issue history](https://github.com/anthropics/claude-code/issues/98584)
// TAGS
claude-codecoding-agentai-codingagentsecurityguardrailstool-use

DISCOVERED

2h ago

2026-11-06

PUBLISHED

4h ago

2026-11-05

RELEVANCE

9/ 10

AUTHOR

motoroco