Report it through OpenSea's Bugcrowd program:

https://bugcrowd.com/engagements/opensea

That is the channel OpenSea's security team monitors, and it is where a report gets triaged and tracked. Please do not open a public GitHub issue, discussion, or pull request describing a vulnerability, and please hold off on public disclosure until the program has responded.

The Bugcrowd brief is the authority on what is in scope, what is excluded, how severity is assessed, and how rewards work. This file deliberately does not restate any of that, because a second copy would drift out of date and contradict the brief. Read the brief before you start.

Response and disclosure timelines are set by the program, not by this repository.

@opensea/sdk is the TypeScript SDK for the OpenSea marketplace. It builds orders, produces the payload a wallet signs, fulfills orders onchain, and calls the OpenSea API with the caller's key.

It moves assets. Code here decides what a user is asked to sign and what a transaction ends up doing, so bugs in order construction, signing payloads, approval handling, or recipient and amount arithmetic can cost a user NFTs or tokens. Include the inputs and the resulting order or calldata when you report something in that area.

This repository is a read-only mirror published from a private OpenSea monorepo. A fix lands here as a synced commit rather than as a merged pull request, so do not read the absence of a PR as the absence of a fix.

• Test against production. Do not run exploit attempts against opensea.io, api.opensea.io, or any other OpenSea-operated service. Reproduce against a local build, a testnet, or your own deployment.
• Run automated scanners, fuzzers, or crawlers against opensea.io or the OpenSea API. That traffic is indistinguishable from an attack, it gets blocked, and raw scanner output on its own is not a report.
• Touch accounts, wallets, or data that are not yours. Use your own.
• Attempt denial of service, spam, or social engineering against OpenSea staff, users, or infrastructure.

We cannot accept a finding that required breaking one of these to produce, however real the underlying bug is.