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Ever heard of correlation does not equal causality?
Steam is not the leak. They cna't possibly be, as they do not save the full details like your Card Security Code as that would be illegal.
Still, somehow someone got it, from you!
As I use that card for steam only online...... have not used that card for any other online transactions....
Doesn't matter. If you get a key logger, it could record the information needed.
Skimmers are a thing too, if you us your physical card in a store.
If someone had access to your physical wallet, they could get the numbers.
Credit cards information is also sat on at time by those who obtained it, to either resell to others or wait until they think it won't be noticed.
While the card was used to make a Steam purchase, that does not mean that they got the information through Steam, only that it was used on Steam. They could have easily used it at Target or some other store.
Order a new one
Heck if its a RFID card sadly they can even walk next to you and steal the number these days.....
If the transactions don't show in your account, then that means your card was used on other accounts.
THAT MEANS someone got access to your card (be it physically or digitally (keylogger, skimmer ect.))
It has nothing to do with Steam.
Not really. That is a common misconception. It takes strong equipment to read the card and even then, it is highly encrypted. The first RFID versions that came out were stored in plain text format though. That was why they were so easy to steam information from.
You keep mentioning no other "online" transactions, but what about "offline" ones? If you used it in a store, it's highly likely their card reader was compromised.
I had a brand new card last year, only used on two places online and in one store. Its information was stolen via a compromised card reader in that store and used on the other side of the globe to attempt purchases.
That would harm OP's account as well since the card was used there.
And I believe that card can longer be used (unsure).
Do not do that as that would hit steam with penalties they don;'t deserve. Simply contacting your credit card company and reporting the card stolen will resolve the issue as basically every credit card has theft protection.
Unsure, the CARD would be permanently blacklisted, not sure how that works with a new card being issued if it follows the account.
https://help.steampowered.com/en/wizard/HelpWithUnknownCharges