I do not know of any attacks against encrypt-then-MAC CBC-mode but I believe at least part of the rationale behind the migration away from CBC-mode is due to in

I do not know of any attacks against encrypt-then-MAC CBC-mode but I believe at least part of the rationale behind the migration away from CBC-mode is due to increased complexity of decryption. With CBC-mode decryption I have at least one extra step (validating padding), which as the blog post mentions has been troublesome.