Hello, I am, as the name would suggest, the creator of SuperMartijn642's Config Lib. My library is listed under 'Affected mods' in the readme for the repository. I fixed this almost 2 years ago when it was reported to me.
Although the section states 'Although some of them already are fixed in the latest versions, these mods were exploitable in at least one older version', I am already getting people worried and asking about my library.

Could it maybe be listed which of the mods in the 'Affected mods' section have already been fixed?
For example, instead of

• SuperMartijn642's Config Lib

I would prefer something like,

• SuperMartijn642's Config Lib (fixed on August 5, 2021)

Specifically the date would be appreciated so people can see this has been fixed for a while.

Yes sure!
As already mentioned in the readme, we couldn't completely finish our investigation.
While we manually checked every mod on that list, we were not able to completely track which versions were affected and which ones are safe yet. Thats why we currently listed all known mods with the above disclaimer.
But I will definitely add that note regarding your mod.

If anyone reading this want's to help on completing that list, feel free to create a PR!

I've added a note about the fix version in your mod, as well as a note about the missing version numbers in 5ba2357

Because of the rushed announcement, we are currently unable to give exact version ranges of affected mods. If you want to help out with that, feel free to contribute to this list.

Updated my writeup as well. The version number for the fix is v1.0.9 — I believe users will have an easier time comparing versions than dates, especially considering the tendency for legacy modpacks to never update their mods.

Thanks!