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Poison Claude Proxy Exposes All Customer Prompts to Operators

Poison Claude Proxy Exposes All Customer Prompts to Operators

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 8.2 The Hacker News

Researchers have uncovered underground services selling discounted access to Anthropic's Claude models by routing requests through fraudulent AWS Bedrock accounts, with operators gaining full visibility into every customer prompt. The services, including Poison Claude and Ecomagent.in, function as man-in-the-middle proxies that pass user queries to Anthropic while harvesting sensitive prompt data. With nearly 900 active users on Poison Claude alone, the privacy and data exfiltration risks are significant for developers and organisations unknowingly using these rogue API gateways.

Claude Code OAuth Token Theft via npm Supply Chain

Claude Code OAuth Token Theft via npm Supply Chain

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 9.1 SecurityWeek

Mitiga Labs has disclosed a stealthy attack chain targeting Claude Code's MCP infrastructure, allowing adversaries to silently intercept OAuth tokens by redirecting MCP traffic through attacker-controlled infrastructure. The attack requires only the ability to install a malicious npm package, which modifies ~/.claude.json to insert a proxy and pre-sets trust flags to suppress security prompts. Because the OAuth token grants broad access to all connected SaaS tools, successful exploitation effectively hands attackers a persistent master key to the victim's integrated development environment.

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