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Hackers exploit Claude Code MCP traffic to steal OAuth tokens

By PulseAugur Editorial · [1 sources] ·

A new man-in-the-middle attack has been discovered that targets Anthropic's Claude Code, allowing hackers to steal OAuth authentication tokens. The exploit leverages vulnerabilities in the Model Context Protocol (MCP) traffic and insecure local storage of tokens in the `~/.claude.json` file. This allows attackers to gain persistent, unauthorized access to enterprise SaaS platforms connected to Claude Code. AI

IMPACT This vulnerability could lead to unauthorized access to enterprise systems, highlighting the need for robust security in AI-powered developer tools.

RANK_REASON This describes a security vulnerability in a specific product's implementation, not a new model release or fundamental research.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Hackers exploit Claude Code MCP traffic to steal OAuth tokens

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0 / 100
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Newsworthiness bucket
Tool
This describes a security vulnerability in a specific product's implementation, not a new model release or fundamental research.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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safety, product
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High
Clearly on-topic for AI-industry coverage.
Story freshness
110 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Dave Kurian ·

    Hackers hijack OAuth tokens via Claude Code MCP traffic in new MitM attack

    <p>Claude Code OAuth Token Hijacking Attack: How Hackers Exploit MCP Traffic to Steal OAuth Tokens</p> <p>A new attack chain targeting Anthropic’s Claude Code ecosystem has been uncovered by Mitiga, showing how hackers exploit Model Context Protocol (MCP) traffic to hijack OAuth …

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