As reported by @TimothyBJacobs in https://meta.trac.wordpress.org/ticket/4879:
I tried using grunt upload_patch:48819 to upload a patch. I ended up using an incorrect password and received a strange error message.
{{{
Warning: Something went wrong when attempting to upload the patch. Please confirm your credentials and the ticket number. Error: Unknown XML-RPC tag 'TITLE'
}}}
Reading it again, it says confirm your credentials in the message, but I didn't notice it even after reading it three times. I was hung up on the error portion of the message. So this might just be user error and can be closed :)