Anthropic MCP Python SDK Flaw Enables OAuth Credential Theft and Account Takeover

Security researchers have disclosed a high-severity vulnerability in Anthropic’s Model Context Protocol (MCP) Python SDK. This flaw could allow a malicious MCP server to steal OAuth credentials, potentially taking over user accounts. The vulnerability affects MCP client deployments that use HTTP transport and includes vulnerable SDK releases from versions 1.9.1 to 2.1.1. Research from Cycode […]

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