Check https://audit-hero.com/finding to search for previous findings. The .md Github repository is not available anymore.
Code4rena lists their contest result in an unsearchable list. There is no possibility to search through all of the issues.
This product is a Github repository that contains all of the reports and their findings in .md files. Consider if you have an idea on what could be wrong with the Solidity code. You would then want to verify if this kind of issue has been submitted before. To figure this out you would need to click through all of the Code4arena links and search in separate pages.
To help with this problem I have created a Github repository that you can use to search through all of the code4are submissions. It essentially aggregates all of the findings into separate .md files. You clone the repository and can browse the files
I will update this repository with new results as they come along.
A link to the private git repository