I suggest reading these:

https://github.com/insight-decentralized-consensus-lab/post-quantum-monero

https://monero.stackexchange.com/questions/1495/what-privacy-issues-did-monero-have-and-still-has/1496

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tldr: clear net monero protocol has a known open attack vectors

The last link is almost 8 years old...all issues have been long addressed with RingCT, enforced default ring size, etc with FCMP++ around the corner resolving any remaining issues with rings