B1ack's Stash carding marketplace publicly releases 4.6M card records — SOCRadar attributes collection to e-skimming and phishing; not confirmed by issuing banks

The dark-web carding marketplace B1ack's Stash — operational since at least 2023, with prior free-release waves of 1M cards in April 2024 and 4M in February 2025 — announced the free release of approximately 4.6 million stolen credit and debit card records on 2026-05-18 as a punitive action against vendors that cross-listed cards on competing shops (SOCRadar, 2026-05-18; Security Affairs, 2026-05-20). Each record carries the full primary account number, expiration date, CVV2, cardholder name, billing address, email, phone number and source IP — sufficient detail for card-not-present (CNP) fraud. SOCRadar's analysis estimates ~4.3 million records are net-new after de-duplication and expired-card filtering; geographic distribution is approximately 70 % US-issued, with Canada, UK, France, Malaysia, Hong Kong, Singapore and Thailand as secondary sources. SOCRadar attributes the collection methodology to e-skimming and phishing based on capture completeness. This is a dark-web marketplace claim — B1ack's Stash listed the dump for free, but no individual issuing bank has confirmed that specific cards originated from their systems. Defender takeaway: Swiss and European card-fraud teams should query their compromise feeds (FS-ISAC, card-network compromise files) for matching BIN ranges and review e-skimming exposure on legacy WooCommerce / Magento storefronts in the customer-facing estate; the consistent collection-method finding across multiple B1ack's Stash waves points at front-end JavaScript skimmer infections as the upstream root cause that still goes undetected in many low-volume merchant configurations.