importantSYS.SOURCE: The Hacker News• 2026-09-29T11:38:25+05:30

MCP Python SDK Vulnerability Enables OAuth Credential Theft via Malicious Servers

#oauth #sdk #vulnerability

A critical vulnerability in the MCP Python SDK allows malicious servers to steal OAuth credentials by intercepting client secrets and authorization codes. The issue is resolved in versions 1.30.0 and 2.2.0, with recommendations to upgrade and revoke compromised tokens.

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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> OPTIMIZING LLM OUTPUT EFFICIENCY THROUGH HISTORICAL TELEGRAPHESE COMPRESSION TECHNIQUES > CISO INSIGHTS REVEAL CYBER RISK SHIFTS TOWARD INTERNAL WORKFLOWS > FBI WARNS OF ONGOING FORTIBLEED CAMPAIGN TARGETING FORTINET DEVICES WITH 86,644 CREDENTIALS COMPROMISED > CRITICAL ATLASSIAN DATA CENTER VULNERABILITY CVE-2026-21589 EXPLOITED WITHIN TWO HOURS OF DISCLOSURE > AGENTIC PENTESTING: PROOFS, LIMITATIONS, AND CONTINUOUS VALIDATION CHALLENGES > CHROME INTEGRATES JPEG XL FOR ENHANCED IMAGE COMPRESSION > EXPLOITING LARGE LANGUAGE MODELS AND DATA POISONING TO MANIPULATE CONSENSUS > ADVANCEMENTS IN SYNTHETIC BIOLOGY ENABLE CREATION OF MIRROR-LIFE ORGANISMS > CANADIAN STUDY WARNS PERMANENT DAYLIGHT SAVING TIME POSES RISKS TO SLEEP AND MENTAL HEALTH > RISING PS5 JAILBREAKS POSE SIGNIFICANT SECURITY CHALLENGES> OPTIMIZING LLM OUTPUT EFFICIENCY THROUGH HISTORICAL TELEGRAPHESE COMPRESSION TECHNIQUES > CISO INSIGHTS REVEAL CYBER RISK SHIFTS TOWARD INTERNAL WORKFLOWS > FBI WARNS OF ONGOING FORTIBLEED CAMPAIGN TARGETING FORTINET DEVICES WITH 86,644 CREDENTIALS COMPROMISED > CRITICAL ATLASSIAN DATA CENTER VULNERABILITY CVE-2026-21589 EXPLOITED WITHIN TWO HOURS OF DISCLOSURE > AGENTIC PENTESTING: PROOFS, LIMITATIONS, AND CONTINUOUS VALIDATION CHALLENGES > CHROME INTEGRATES JPEG XL FOR ENHANCED IMAGE COMPRESSION > EXPLOITING LARGE LANGUAGE MODELS AND DATA POISONING TO MANIPULATE CONSENSUS > ADVANCEMENTS IN SYNTHETIC BIOLOGY ENABLE CREATION OF MIRROR-LIFE ORGANISMS > CANADIAN STUDY WARNS PERMANENT DAYLIGHT SAVING TIME POSES RISKS TO SLEEP AND MENTAL HEALTH > RISING PS5 JAILBREAKS POSE SIGNIFICANT SECURITY CHALLENGES