What if wrong person signs a contract who isnt legally allowed to because property does not belong to them?

If the contract affects the property then it is null and void and unenforceable if the owner didn't sign it.

If the contract affects the property then it is null and void and unenforceable if the owner didn't sign it.

If the contract affects the property then it is null and void and unenforceable if the owner didn't sign it.

If the contract affects the property then it is null and void and unenforceable if the owner didn't sign it.