Bitcoin Core developer says COLDCARD MK3 vulnerability has been reproduced, MK2/MK3 devices may be affected
He believes the issue affects MK2/MK3 devices, but currently cannot confirm whether the MK4 is vulnerable.
Developer Antoine Poinsot stated that the key difference is that the MK4 uses a hardware random number generator to provide entropy for the seed and actually uses the microcontroller's true random number generator (TRNG), which the MK3 does not use.
This proof of concept and mnemonic verification are still under review.
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