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Can you decrypt RSA ciphertext given Decryption Oracle and public exponent only?

et flag

Linked is a website that has a capture the flag problem with RSA: https://konsolas-2022-04-24.herokuapp.com/

I know very little about RSA decrypting but I do want to try and solve it, but I'm not sure where to start. I found https://www.tausquared.net/src/pages/ctf/rsa.html which would be useful if I knew the public exponent, but unfortunately I don't.

Is it possible to decrypt the ciphertext, and if so, could you provide any hints on how to start? Thanks.

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