Hello Mateusz,
Thanks for reaching out to Coinbase Support. If you did not authorize any outgoing transactions from your Coinbase Wallet, it means that your recovery phrase has been compromised.
Because your Coinbase Wallet is a user-controlled and non-custodial product, which means that only you have full control/access to your wallet (including the recovery phrase), we cannot provide any further details about how it was compromised nor can we help recover these funds.
Due to the irreversible nature of cryptocurrency protocols, transactions can neither be cancelled or reversed once confirmed on the blockchain. If you still hold any funds, we recommend that you immediately send them to a secure address. You can create a new Coinbase Wallet and then transfer those funds to your new Wallet. Note that we cannot generate a new key for your new Wallet. For more information, please visit the Coinbase Wallet FAQ page: https://wallet.coinbase.com/faq/
If you have not already done so, it’s very important that you report this incident to law enforcement agencies in your jurisdiction as well as the FBI Internet Crime Complaint Center (IC3): https://www.ic3.gov/complaint/default.aspx/
Coinbase is willing to offer full cooperation with all law enforcement investigations pertaining to your account’s compromise. Please don’t hesitate to reach out.