Researcher Finds OpenSea Undocumented Server Leaking API Keys and Usernames

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A security researcher discovered an undocumented MCP server at mcp.opensea.io/mcp while manually exploring OpenSea's internal tooling. Two exposed endpoints allowed anyone to generate a valid API key without authentication and then resolve any Ethereum wallet address linked to an OpenSea profile to its owner's username. The flaw raised serious privacy concerns, as pseudonymous wallet holders could potentially be identified and targeted through phishing or doxxing. Sensitive tools on the same server, such as order cancellation, were properly protected behind a wallet JWT, suggesting the exposure was limited to the discovery layer rather than a systemic architectural failure. The researcher reported the issue to OpenSea's Bugcrowd bug bounty program, where it currently awaits official severity triage.

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Solo Developer Relaunches Failed Chat App with No User Media and Mandatory AI Disclosure

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

Advanced Server-Side Caching Patterns for Next.js 14 Production Apps

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