You can try the following free open source resources:
- https://www.coe.int/en/web/common-european-framework-reference-languages/reference-level-descriptions
- For levels from A1 to B2 there are some textbooks for English vocabulary on the Books4Languages website that you can access and receive a Creative Commons license (for example, here is the link for the A1 level https://open.books4languages.com/english-a1-vocabulary/ ).
- For levels C1 and C2 there are two papers provided by the University of Macedonia and that you can access and download for free from here: https://www.toe.gr/pluginfile.php?file=%2F2143%2Fmod_resource%2Fcontent%2F1%2FLevel%20C1%20Word%20List.pdf for C1 and https://www.toe.gr/pluginfile.php?file=%2F2144%2Fmod_resource%2Fcontent%2F1%2FLevel%20C2%20Word%20List.pdf for C2.