I've sent both the recently expired DigiCert certs.
Could be just about anything. In my case, my keychain has followed me from one Mac to the next since before the cert that expired today was ever issued, so it could have ended up in there anytime in the last ~8 years from anything I might have had installed dating back to my PowerBook G4...
Virtualization software might be a candidate.
Actually, I just had another thought: Steam. And when I just tried to go to https://store.steampowered.com/, guess what certificate is in the trust chain?
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I've sent both the recently expired DigiCert certs.
Could be just about anything. In my case, my keychain has followed me from one Mac to the next since before the cert that expired today was ever issued, so it could have ended up in there anytime in the last ~8 years from anything I might have had installed dating back to my PowerBook G4...
Virtualization software might be a candidate.
Actually, I just had another thought: Steam. And when I just tried to go to https://store.steampowered.com/, guess what certificate is in the trust chain?
Two Macs here, both with Steam, both have the problem. Oh, they both have VirtualBox as well.
I had the expired certificate. I've never installed Steam, but I have installed VMWare Fusion.
I used to have the cert (deleted a while ago), and I've never installed Steam.