
PCI DSS 4.0.1 in 2026: The Small Merchant's Guide to SAQ A, Script Tampering, and MFA
PCI DSS v4.0.1 governs every 2026 assessment, and FAQ 1588 has narrowed who qualifies for SAQ A. This guide walks small merchants through the new script-tampering rules (6.4.3 and 11.6.1), the 12-character password and MFA requirements, what non-compliance actually costs, and a 12-step checklist for getting it right.










