// Hacker Noon · 16 March 2026

Claude Code Security Analysis: Understanding the CVE-2026-21852 API Key Exfiltration Vulnerability

The vulnerability has already been patched by Anthropic. Claude Code communicates with Anthropic's services using an API key, transmitted with each authenticated request. By manipulating a repository-controlled configuration setting, API traffic could be redirected to an attacker-controlled server.

Hacker Noon

@hacker-noon · shekar.munirathnam

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