Official MCP Python SDK Flaw Can Let Malicious Servers Steal OAuth Credentials
A malicious MCP server could trick an application built on the official MCP Python SDK into handing over the OAuth credentials it uses to log in to a real service, the SDK's maintainers said in a security advisory.
Affected versions sent the client secret, the authorization code, and the PKCE proof key to a token endpoint the attacker controlled. The fix is in versions 1.30.0 and
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Raghib Awan
Raghib Awan is an Information Security and Technology professional with expertise spanning cybersecurity, cloud security, IT infrastructure, information risk, regulatory compliance, and enterprise security. He is also an author at TeQManch, a technology and cybersecurity news platform covering cyber threats, artificial intelligence, BFSI technology, data privacy, digital risk, and emerging technology trends.
