If seedPhrase and passPhrase of a token address leaked, what's the effect?

Hi

If seedPhrase and passPhrase of a token address leaked, what’s the effect? Is it a security issue to worry about?

Example:
The token address of USDC is EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v.

What if the seedPhrase and passPhrase or the secret key json of token address of USDC is leaked, what a bad guy can do? Can he change the Mint Authority, Freeze Authority or any other havoc?

Best regards
Sagara

Is it safe to assume that the seedPhrase and passPhrase of a Solana fungible token vanity address going to wrong hand has no apparent security issue to the token itself as long as you protect the Mint Authority and Freeze Authority well?